TNG Episode Overview: Season 4

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 4x01 THE BEST OF BOTH WORLDS, PART II

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Riker leads a fleet of 40 starships to Wolf 359 to confront the Borg, but the fleet's efforts are in vain - every starship is annihilated. An away team boards the cube and kidnaps Locutus to returns him to the Enterprise.
   
 4x02 SUDDENLY HUMAN

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Finding a Talarian vessel, the Enterprise crew discover that one of the ship's crew is actually a human teenager. Dr. Crusher's examinations reveal that he has been injured in the past - and it's likely that these injuries were not accidental.
   
 4x03 BROTHERS

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The Enterprise is suddenly diverted from her course to an unknown planet. What no one realizes is that Data is responsible for this, having been taken over by a homing signal that leads him to his creator, Dr. Soong.
   
 4x04 FAMILY

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In drydock the Enterprise is undergoing extensive repairs while the crew, most notably Picard, recover from the Borg attack. Picard returns to France for a less than warm welcome from his brother.
   
 4x05 REMEMBER ME

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Dr. Crusher's old friend, Dr. Quaice, is leaving his former home on a Starbase to retire. When the Enterprise becomes ready to leave the starbase, Crusher helplessly watches the entire crew disappear one by one.
   
 4x06 LEGACY

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Rushing into dangerous territory, the Enterprise is looking for an escape pod when they find two cadres - urban gangs so large they have replaced the government and now conduct their street fighting on a warlike scale.
   
 4x07 REUNION

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The Enterprise is intercepted by a Klingon battlecruiser occupied by K'mpec, leader of the High Council. With him is K'ehleyr, Worf's former lover, who has visited the Enterprise before. Picard is asked to supervise the handover of the title Leader of the Council.
   
 4x08 FUTURE IMPERFECT

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While investigating suspicious energy readings, Riker is overcome by toxic gases and awakens in the sickbay of the Enterprise, told by an older Dr. Crusher that sixteen years have passed since that event.
   
 4x09 FINAL MISSION

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Picard reveals that Wesley has been accepted into Starfleet Academy. Wes's final assignment on the Enterprise is to accompany Picard on a trip with a miner to settle a dispute. En route, the battered miner's shuttle breaks down, forcing them to land on a desert world.
   
 4x10 THE LOSS

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Troi begins to experience severe pain, and at the same time, the Enterprise is suddenly unable to go to warp speed. Troi soon realizes that she's lost her empathic sense, and the Enterprise is heading uncontrollably toward a black-hole-like cosmic string.
   
 4x11 DATA'S DAY

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Data records his observations of an average day. Preparations are underway for the marriage of Chief O'Brien and Keiko, and the Enterprise is transporting a secretive Vulcan ambassador to the Neutral Zone.
   
 4x12 THE WOUNDED

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Captain Maxwell of the Phoenix has severed contact with Starfleet and has been raiding the vessels and transports of the Cardassians, a race once at war with the Federation but now peaceful under an uneasy treaty.
   
 4x13 DEVIL'S DUE

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The Enterprise is sent to retrieve a Federation anthropological team, only to discover that the population is in a state of chaos, believing their peaceful way of life is to end with the 'second coming' of the devil.
   
 4x14 CLUES

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The Enterprise is on a routine mission when an investigation of an unknown planet sends the Enterprise through a wormhole, rendering everyone but Data unconscious.
   
 4x15 FIRST CONTACT

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Riker, undercover on Malcoria, is injured in a riot and taken to a hospital, where his true nature is deduced by Malcorian doctors while Riker remains out of touch with the Enterprise.
   
 4x16 GALAXY'S CHILD

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Geordi is delighted to welcome Dr. Brahms aboard the Enterprise, but the real Dr. Brahms is nothing like her holodeck alter-ego. Meanwhile, the Enterprise inadvertantly destroys a space creature and helps to deliver its newborn child with unexpected results.
   
 4x17 NIGHT TERRORS

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The Enterprise is immobilized by a dangerous natural phenomenon and members of the crew begin hallucinating slowly edging toward the same kind of madness that drove the derelict starship Brittain's crew to kill themselves.
   
 4x18 IDENTITY CRISIS

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Starfleet officers including Geordi La Forge who investigated a mysterious migration of explorers to the planet Tarchannen III are beginning to mutate into alien life forms and migrate to the planet themselves.
   
 4x19 THE NTH DEGREE

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Shortly after nervously performing a scene from a play, Barclay is assigned to accompany Geordi on an examination of an alien probe. But after being scanned, the probe somehow singles Barclay out to receive a massive mental 'upgrade'.
   
 4x20 QPID

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Picard is readying a speech and is surprised to find that Vash is present at his presentation. She and Picard seem to be able to agree on nothing, which catches the attention of Q, who sends the crew, Vash, and even himself, into Sherwood Forest.
   
 4x21 THE DRUMHEAD

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After an apparent sabotage of the Enterprise's warp drive, Starfleet sends Admiral Satie to investigate the possibility of a Klingon faction cooperating with Romulans. But Satie goes beyond that, accusing Picard of aiding both the Romulans and the Borg.
   
 4x22 HALF A LIFE

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Dr. Timicin has beamed aboard the Enterprise to travel to a star much like his planet's own sun to conduct tests. Lwaxana Troi soon falls for the Doctor but is horrified to find out he is expected to commit suicide at the age of sixty.
   
 4x23 THE HOST

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Ambassador Odan is being transported to attempt eleventh-hour mediation between two civilizations and on the two week trip he and Dr. Crusher have fallen in love. When Odan is severely injured, he is forced to reveal he is merely host to an alien lifeform.
   
 4x24 THE MIND'S EYE

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En route to a conference, Geordi is kidnapped by Romulans and brainwashed to obey instructions. When he returns to the Enterprise, he unwittingly becomes a pawn in a much bigger game.
   
 4x25 IN THEORY

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Lt. Jenna D'Sora becomes attached to Data, who at first protests that he has no human feelings, and then attempts to emulate emotions. In the meantime, a dangerous nebula lies in the path of the Enterprise.
   
 4x26 REDEMPTION, PART I

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The Enterprise is summoned to the Klingon homeworld so Picard may fulfill his duty as arbiter of the succession. Gowron intercepts the Enterprise before it arrives, warning Picard that Klingon civil war is brewing.