Some of the episode overviews may contain spoilers, but attempts are made to limit their spoilage. Note that when a stardate is given at the beginning of an episode, the second-from-the-left digit in the stardate gives the number of the season in which the episode initially aired.
| Pic | Title | Original Airdate | Stardate | Episode #
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| "Encounter at Farpoint" | September 28, 1987 | 41153.7 | 101 & 102
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| The new starship Enterprise begins its maiden voyage by uncovering the mysteries of an advanced space station. But their mission is threatened by a god-like being named Q.
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| "The Naked Now" | October 5, 1987 | 41209.2 | 103
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| A mysterious contaminant causes the crew to act intoxicated. Reworked TOS episode 4, "The Naked Time".
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| "Code of Honor" | October 12, 1987 | 41235.25 | 104
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| Lt. Yar is abducted by the leader of a people who abides by a strict code of honor, which results in a fight to the death.
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| "The Last Outpost" | October 19, 1987 | 41194.6 | 105
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| An unknown force immobilizes the Enterprise while encountering a new alien threat - the Ferengi.
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| "Where No One Has Gone Before" | October 26, 1987 | 41263.1 | 106
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| An alien visitor takes the Enterprise on a wild trip outside of the galaxy, where the crews imagination comes to life.
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| "Lonely Among Us" | November 2, 1987 | 41249.3 | 107
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| An alien entity takes control of Crusher, Worf and Picard. To make the situation worse, the Enterprise is transporting delegates from two feuding planets.
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| "Justice" | November 9, 1987 | 41255.6 | 108
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| Wesley breaks an idyllic world's trivial law of accidentally stepping on flowers and faces the death sentence.
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| "The Battle" | November 16, 1987 | 41723.9 | 109
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| Captain Picard is reunited with his old ship, the Stargazer, and is lured into a trap by a vengeful Ferengi.
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| "Hide and Q" | November 23, 1987 | 41590.5 | 110
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| Q returns to tempt Commander Riker into joining the Q Continuum.
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| "Haven" | November 30, 1987 | 41294.5 | 111
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| Counselor Troi is visited by her mother who prepares her for an arranged marriage.
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| "The Big Goodbye" | January 11, 1988 | 41997.7 | 112
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| A computer malfunction traps Picard, Data, and Beverly in a 1940s gangster holodeck program.
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| "Datalore" | January 18, 1988 | 41242.4 | 113
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| The Enterprise heads for the Omicron Theta system, home of Data, where he finds and reactivates his twin brother, Lore, and encounter the Crystalline Entity.
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| "Angel One" | January 25, 1988 | 41636.9 | 114
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| The Enterprise visits a world dominated by women to flesh out diplomatic ties and search for survivors of a downed freighter.
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| "11001001" | February 1, 1988 | 41365.9 | 115
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| Curious little aliens, the Bynars, retrofit the Enterprise's computer in a spacedock. But they then hijack the ship and head it to their homeworld...
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| "Too Short a Season" | February 8, 1988 | 41309.5 | 116
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| The Enterprise transports a legendary geriatric admiral who must once again negotiate a hostage situation. But he is amazingly getting younger...
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| "When the Bough Breaks" | February 15, 1988 | 41509.1 | 117
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| A highly advanced mythical planet reveals itself to the Enterprise. But only to steal its children.
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| "Home Soil" | February 22, 1988 | 41463.9 | 118
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| The crew of the Enterprise discovers a crystalline lifeform with murderous intelligence that has been killing the scientists on a terraforming project.
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| "Coming of Age" | March 14, 1988 | 41461.2 | 119
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| While Wesley takes a Starfleet Academy entrance exam, the senior staff of the Enterprise are placed under investigation.
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| "Heart of Glory" | March 21, 1988 | 41503.7 | 120
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| Fugitive Klingons try to hijack the Enterprise and ask Worf to join them.
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| "The Arsenal of Freedom" | April 11, 1988 | 41798.2 | 121
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| The demonstration of an advanced planetary defense system turns deadly, as an away team is trapped on the deadly planet.
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| "Symbiosis" | April 18, 1988 | Unknown | 122
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| Picard tries to mediate a trade dispute between two neighboring planets, one who is apparently the only hope for saving the other from a fatal disease.
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| "Skin of Evil" | April 25, 1988 | 41601.3 | 123
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| A vile tar-like creature composed of pure evil interferes with a rescue mission and holds Deanna Troi hostage.
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| "We'll Always Have Paris" | May 2, 1988 | 41697.9 | 124
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| Picard meets an old flame, whose husband has created a haywire dimensional experiment.
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| "Conspiracy" | May 9, 1988 | 41775.5 | 125
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| The strange behavior of high-ranking officers leads Picard to uncover a conspiracy within Starfleet.
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| "The Neutral Zone" | May 16, 1988 | 41986.0 | 126
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| A derelict satellite is found with cryogenically frozen humans aboard as the Enterprise is sent to investigate the destruction of outposts near Romulan space.
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| Pic | Title | Original Airdate | Stardate | Episode #
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| "The Child" | November 21, 1988 | 42073.1 | 201
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| Dr. Pulaski joins the Enterprise while La Forge prepares the Enterprise to carry dangerous plague specimens and Deanna gives birth to a mysterious child, Ian.
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| "Where Silence Has Lease" | November 28, 1988 | 42193.6 | 202
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| The Enterprise becomes enveloped by a "hole in space" containing a Romulan warship and a duplicate Enterprise, but find it's not accidental - it's the work of a powerful alien.
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| "Elementary, Dear Data" | December 5, 1988 | 42286.3 | 203
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| Geordi asks the holodeck to make a Sherlock Holmes villain that can defeat Data. However the resulting Professor Moriarty soon appears far more powerful than estimated!
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| "The Outrageous Okona" | December 12, 1988 | 42402.7 | 204
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| The Enterprise encounters a flamboyant space rogue on the run, while Data learns humor from Joe Piscopo.
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| "Loud as a Whisper" | January 9, 1989 | 42477.2 | 205
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| The Enterprise hosts a deaf empathic ambassador who leads difficult peace talks.
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| "The Schizoid Man" | January 23, 1989 | 42437.5 | 206
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| A brilliant scientist, Dr. Ira Graves, cheats death by uploading his memories and personality into Data.
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| "Unnatural Selection" | January 30, 1989 | 42494.8 | 207
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| The Enterprise receives a distress call from the USS Lantree where they find everyone dead from rapid aging and they must find the cause before scientists on a research colony suffer the same fate.
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| "A Matter of Honor" | February 6, 1989 | 42506.5 | 208
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| Riker is assigned to a Klingon vessel during an officer exchange program.
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| "The Measure of a Man" | February 13, 1989 | 42523.7 | 209
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| Data is put on trial to determine if he is a private citizen or Federation property.
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| "The Dauphin" | February 20, 1989 | 42568.8 | 210
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| The Enterprise hosts a young world leader and her mysterious chaperone. However, Wesley soon falls in love.
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| "Contagion" | March 20, 1989 | 42609.1 | 211
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| A dangerous alien computer virus runs rampant through the Enterprise after causing the destruction of another Federation vessel.
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| "The Royale" | March 27, 1989 | 42625.4 | 212
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| Riker, Worf and Data become part of a bad novel set in a casino.
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| "Time Squared" | April 3, 1989 | 42679.2 | 213
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| Picard encounters his double, when the Enterprise becomes caught in a time loop.
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| "The Icarus Factor" | April 24, 1989 | 42686.4 | 214
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| Riker's estranged father pays him a visit, and Worf prepares for an important rite of passage.
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| "Pen Pals" | May 1, 1989 | 42695.3 | 215
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| Data befriends a child from a doomed planet, breaking the Prime Directive.
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| "Q Who?" | May 8, 1989 | 42761.3 | 216
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| Q fires the ship to the other side of the galaxy and introduces the crew of the Enterprise to the deadly Borg.
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| "Samaritan Snare" | May 15, 1989 | 42779.1 | 217
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| A group of dimwitted aliens, the Pakleds kidnap Geordi to fix their malfunctioning ship.
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| "Up the Long Ladder" | May 22, 1989 | 42823.2 | 218
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| Picard must bring two incompatible cultures together, because if they don't they will both die out.
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| "Manhunt" | June 19, 1989 | 42859.2 | 219
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| Deanna's mother is in the market for a new husband, and she has her eyes on Picard .
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| "The Emissary" | June 29, 1989 | 42901.3 | 220
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| Worf's ex-girlfriend comes to the Enterprise to help deal with a Klingon sleeper ship.
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| "Peak Performance" | July 10, 1989 | 42923.4 | 221
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| An alien engineer, who leads a starship combat simulation, gives Data a personality complex.
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| "Shades of Gray" | July 17, 1989 | 42976.1 | 222
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| An alien bug bite puts Riker's life in danger. As he lies on his deathbed, he recalls his memories of his life on the Enterprise.
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| Pic | Title | Original Airdate | Stardate | Episode #
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| "Evolution" | September 25, 1989 | 43125.8 | 301
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| Nanites escape Wesley's lab, and disrupt an astronomer's critical solar experiment.
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| "The Ensigns of Command" | October 2, 1989 | 43133.3 | 302
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| Data must convince a stubborn colony to give up their homeland under threat of a powerful and mysterious race.
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| "The Survivors" | October 9, 1989 | 43152.4 | 303
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| The Enterprise tries to assist the last two survivors of an annihilated world. But their entire world has been transformed to dust except their one little garden and house!
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| "Who Watches the Watchers?" | October 16, 1989 | 43173.5 | 304
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| A holographically camouflaged Federation anthropology station is accidentally revealed to the natives of a primitive Vulcan-like culture.
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| "The Bonding" | October 23, 1989 | 43198.7 | 305
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| A mysterious entity seeks to comfort a boy who has lost his mother in an accident on its planet.
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| "Booby Trap" | October 30, 1989 | 43205.6 | 306
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| The Enterprise falls victim to an ancient booby trap set to snare starships.
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| "The Enemy" | November 6, 1989 | 43349.2 | 307
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| Geordi is trapped on a harsh planet with a hostile Romulan, and the two must work together to survive.
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| "The Price" | November 13, 1989 | 43385.6 | 308
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| Troi falls in love with a charismatic negotiator who vies for rights to a wormhole. But several differant groups are after the wormhole as it may be the only known stable wormhole in existence.
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| "The Vengeance Factor" | November 20, 1989 | 43421.9 | 309
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| Riker exposes an assassin in the midst of critical peace talks.
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| "The Defector" | January 1, 1990 | 43462.5 | 310
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| Determined to avert a war, a Romulan Commander defects to warn Picard of his Empire's invasion plans.
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| "The Hunted" | January 8, 1990 | 43489.2 | 311
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| A genetically advanced soldier reveals the hidden past of a world hoping to join the Federation.
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| "The High Ground" | January 29, 1990 | 43510.7 | 312
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| Dr. Crusher is kidnapped by terrorists who want the Federation to get involved in their struggle.
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| "Déjà Q" | February 5, 1990 | 43539.1 | 313
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| The Q Continuum strips Q of his powers, and dumps him aboard the Enterprise.
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| "A Matter of Perspective" | February 12, 1990 | 43610.4 | 314
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| Riker is accused of murder, and the holodeck is used to reconstruct the events from different perspectives.
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| "Yesterday's Enterprise" | February 19, 1990 | 43625.2 | 315
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| An encounter with the Enterprise-C causes a shift in reality - and the return of the deceased Tasha Yar.
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| "The Offspring" | March 12, 1990 | 43657.0 | 316
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| Data creates an android child, and calls it his daughter.
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| "Sins of the Father" | March 19, 1990 | 43685.2 | 317
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| Worf goes on trial to prove his father's innocence of treason against the Klingon Empire.
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| "Allegiance" | March 26, 1990 | 43714.1 | 318
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| Aliens kidnap Picard and replace him with a double.
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| "Captain's Holiday" | April 2, 1990 | 43745.2 | 319
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| Picard seeks some much needed shore leave, but gets wrapped up in a woman's deadly treasure hunt.
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| "Tin Man" | April 23, 1990 | 43779.3 | 320
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| A gifted telepath Deanna Troi once treated as a patient comes aboard to establish first contact with an unknown vessel in proximity of an unstable star before the Romulans do.
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| "Hollow Pursuits" | April 30, 1990 | 43807.4 | 321
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| Lt. Barclay is discovered to have a dangerous obsession with the holodeck.
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| "The Most Toys" | May 7, 1990 | 43872.2 | 322
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| An obsessed collector is determined to add Data to his private collection of unique items.
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| "Sarek" | May 14, 1990 | 43917.4 | 323
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| The Enterprise hosts Ambassador Sarek, but his deteriorating mental health causes unforeseen problems.
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| "Ménage à Troi" | May 28, 1990 | 43930.7 | 324
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| The Ferengi kidnap Deanna, her mother and Riker.
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| "Transfigurations" | June 4, 1990 | 43957.2 | 325
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| The Enterprise rescues a humanoid with amnesia and incredible healing powers.
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| "The Best of Both Worlds" (Part 1) | June 18, 1990 | 43989.1 | 326
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| Picard is kidnapped by the Borg, who begin their invasion of Federation space.
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| Pic | Title | Original Airdate | Stardate | Episode #
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| "The Best of Both Worlds" (Part 2) | September 24, 1990 | 44001.4 | 401
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| Picard is rescued from the Borg, as the Enterprise races to save Earth.
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| "Family" | October 1, 1990 | 44012.3 | 402
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| Picard goes to France to visit his family and Worf's human parents come aboard the Enterprise.
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| "Brothers" | October 8, 1990 | 44085.7 | 403
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| Data discovers his maker, Noonien Soong, and brother Lore are still alive.
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| "Suddenly Human" | October 15, 1990 | 44143.7 | 404
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| Picard must help a human boy, raised by aliens, decide his fate.
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| "Remember Me" | October 22, 1990 | 44161.2 | 405
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| After an apparent failure of a warp-field experiment, people begin to disappear from the Enterprise with only Dr. Crusher remembering they ever existed.
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| "Legacy" | October 29, 1990 | 44215.2 | 406
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| Tasha Yar's sister Ishara seeks to restore order on their barbaric colony world.
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| "Reunion" | November 5, 1990 | 44246.3 | 407
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| Worf's ex-girlfriend returns, and along with Picard, the two mediate a Klingon power dispute and Worf discovers more family.
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| "Future Imperfect" | November 12, 1990 | 44286.5 | 408
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| A strange phenomena time-warps Riker sixteen years into the future.
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| "Final Mission" | November 19, 1990 | 44307.3 | 409
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| Wesley sets off on his final mission with the Enterprise, but becomes stranded with Picard on a desert planet.
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| "The Loss" | December 31, 1990 | 44356.9 | 410
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| An unknown force captures the Enterprise and causes Deanna to lose her empathic powers.
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| "Data's Day" | January 7, 1991 | 44390.1 | 411
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| Data gets dancing lessons in preparation of Chief O'Brien's wedding as the Enterprise brings Ambassador T'Pel to the Romulans for negotiations.
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| "The Wounded" | January 28, 1991 | 44429.6 | 412
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| A rogue Starfleet Captain jeopardizes the Cardassian peace treaty.
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| "Devil's Due" | February 4, 1991 | 44474.5 | 413
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| Picard tries to save a planet terrified that a mythic figure from their ancient past has returned to enslave them.
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| "Clues" | February 11, 1991 | 44502.7 | 414
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| The crew is knocked unconscious except for Data after going through a wormhole which appeared in front of an unknown class M planet.
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| "First Contact" | February 18, 1991 | Unknown | 415
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| Riker is captured by xenophobic aliens during a botched first contact mission.
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| "Galaxy's Child" | March 11, 1991 | 44614.6 | 416
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| The Enterprise accidentally kills a space creature, and the crew rush to save its unborn child.
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| "Night Terrors" | March 18, 1991 | 44631.2 | 417
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| The Enterprise is trapped in a rift as the crew is plagued by terrifying hallucinations and Deanna has nightmares.
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| "Identity Crisis" | March 25, 1991 | 44664.5 | 418
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| Geordi transforms into an alien creature with strong instinct to return to its planet of origin.
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| "The Nth Degree" | April 1, 1991 | 44704.2 | 419
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| After an encounter with an alien probe Barclay becomes a genius with a mission.
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| "Q-Pid" | April 22, 1991 | 44741.9 | 420
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| Q returns to test Picard's love for an old flame.
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| "The Drumhead" | April 29, 1991 | 44769.2 | 421
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| A witchhunt ensues for suspected Romulan spies aboard the Enterprise.
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| "Half a Life" | May 6, 1991 | 44805.3 | 422
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| Lwaxana Troi finally finds love, but discovers her man must undergo a ritualistic suicide.
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| "The Host" | May 13, 1991 | 44821.3 | 423
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| Dr. Crusher falls in love with an alien man, and discovers his symbiotic attachment with another entity.
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| "The Mind's Eye" | May 27, 1991 | 44885.5 | 424
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| The Romulans brainwash Geordi to carry out a covert mission.
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| "In Theory" | June 3, 1991 | 44932.3 | 425
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| Data begins a romantic relationship with a fellow crewmember.
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| "Redemption" (Part 1) | June 17, 1991 | 44995.3 | 426
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| Worf leaves the Enterprise to join his fellow Klingons in a civil war.
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| Pic | Title | Original Airdate | Stardate | Episode #
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| "Redemption" (Part 2) | September 23, 1991 | 45020.4 | 501
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| Worf leaves the Enterprise to join his fellow Klingons in a civil war.
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| "Darmok" | September 30, 1991 | 45047.2 | 502
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| Picard struggles to communicate with an alien Captain who speaks in metaphors, before an invisible beast tries to kill them both.
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| "Ensign Ro" | October 7, 1991 | 45076.3 | 503
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| Picard tries to mediate relations between the Bajorans and their enemy the Cardassians.
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| "Silicon Avatar" | October 14, 1991 | 45122.3 | 504
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| The crew with the help of a scientist attempt to communicate with the Crystalline Entity.
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| "Disaster" | October 21, 1991 | 45156.1 | 505
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| Command of the Enterprise falls to Counselor Troi during a crisis.
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| "The Game" | October 28, 1991 | 45208.2 | 506
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| Wesley pays a visit to the Enterprise but finds the crew addicted to a computer game.
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| "Unification" (Part 1) | November 4, 1991 | 45236.4 | 507
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| Spock returns from retirement, and attempts to unify the Vulcans and Romulans in peace.
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| "Unification" (Part 2) | November 11, 1991 | 45245.8 | 508
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| See previous overview.
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| "A Matter of Time" | November 18, 1991 | 45349.1 | 509
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| A 26th century time traveler appears on the Enterprise to observe a mission to save a dying planet, but ends up raising the suspicion of the crew.
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| "New Ground" | January 6, 1992 | 45376.3 | 510
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| Worf tries to be a father to his son Alexander while the Enterprise witnesses a new transportation technology.
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| "Hero Worship" | January 27, 1992 | 45397.3 | 511
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| Data saves the life of a young boy, who begins to idolize him.
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| "Violations" | February 3, 1992 | 45429.3 | 512
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| An alien traveling aboard the Enterprise molests Troi through telepathy.
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| "The Masterpiece Society" | February 10, 1992 | 45470.1 | 513
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| The crew tries to save an isolated genetically enhanced human colony.
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| "Conundrum" | February 17, 1992 | 45494.2 | 514
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| The crew's memory is erased, and they attempt to figure out why they are the key part of a war.
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| "Power Play" | February 24, 1992 | 45571.2 | 515
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| Troi, O'Brien, and Data are taken over by entities who want control of the ship.
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| "Ethics" | March 2, 1992 | 45587.3 | 516
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| Worf becomes paralyzed and Dr. Crusher must deal with a controversial surgeon to save his life.
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| "The Outcast" | March 16, 1992 | 45614.6 | 517
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| Riker falls in love with an androgynous being after rescuing some others trapped in "null space."
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| "Cause and Effect" | March 23, 1992 | 45652.1 | 518
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| The crew find themselves repeating the same day, over and over again.
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| "The First Duty" | March 30, 1992 | 45703.9 | 519
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| Wesley gets involved in a conspiracy within Starfleet Academy.
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| "Cost of Living" | April 20, 1992 | 45733.6 | 520
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| Deanna's mother, Lwaxana, returns to marry a man she has never met.
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| "The Perfect Mate" | April 27, 1992 | 45761.3 | 521
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| Picard falls in love with an empathic woman, who is sent to marry an alien leader as a peace offering.
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| "Imaginary Friend" | May 4, 1992 | 45832.1 | 522
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| A child's imaginary playmate threatens the well-being of the Enterprise.
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| "I, Borg" | May 11, 1992 | 45854.2 | 523
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| The Enterprise rescues a Borg survivor, and Picard plans to use him as a weapon against his nemesis.
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| "The Next Phase" | May 18, 1992 | 45092.4 | 524
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| A Romulan accident traps Geordi and Ensign Ro out of phase, while everyone believes they died.
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| "The Inner Light" | June 1, 1992 | 45944.1 | 525
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| A mysterious probe causes Picard to live a lifetime as a married man on an unknown world.
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| "Time's Arrow" (Part 1) | June 15, 1992 | 45959.1 | 526
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| Data is time warped back to San Francisco of the 1800s.
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| Pic | Title | Original Airdate | Stardate | Episode #
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| "Time's Arrow" (Part 2) | September 21, 1992 | 46001.3 | 601
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| Data is time warped back to San Francisco of the 1800s.
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| "Realm of Fear" | September 28, 1992 | 46041.1 | 602
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| Barclay must overcome his fear of the transporter to solve a mystery.
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| "Man of the People" | October 5, 1992 | 46071.6 | 603
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| A psychic ambassador uses Deanna's mind to influence the outcome of his mission.
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| "Relics" | October 12, 1992 | 46125.3 | 604
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| The Enterprise rescues Mr. Scott who has been trapped in a transporter buffer for 75 years.
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| "Schisms" | October 19, 1992 | 46154.2 | 605
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| Strange aliens abduct, and experiment on the crew while they sleep.
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| "True Q" | October 26, 1992 | 46192.3 | 606
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| Q reveals a secret about a young crewmember.
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| "Rascals" | November 2, 1992 | 46235.7 | 607
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| A transporter malfunction turns Picard, Keiko, Ro and Guinan into children.
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| "A Fistful of Datas" | November 9, 1992 | 46271.5 | 608
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| Data's mind is plugged into the ship's computer, and his wandering thoughts create havoc on the holodeck.
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| "The Quality of Life" | November 16, 1992 | 46307.2 | 609
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| Data believes novel "tools" being used at a mining site are sentient machines, and risks everything to protect them.
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| "Chain of Command" (Part 1) | December 14, 1992 | 46357.4 | 610
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| Picard is relieved of command for a mission where he is captured by Cardassians and tortured by a ruthless interrogator, who employs 1984-esque strategies.
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| "Chain of Command" (Part 2) | December 21, 1992 | 46360.8 | 611
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| See previous overview.
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