Star Trek: The Next Generation: 3x18
Allegiance
Stardate: 43714.1. Picard is secretly abducted and switched with an alien double. The crews’ suspicions are raised when he starts exhibiting unusual behaviour, and is relieved of command.
3 - 1Evolution Sep. 25, 1989
3 - 2The Ensigns of Command Oct. 02, 1989
3 - 3The Survivors Oct. 09, 1989
3 - 4Who Watches the Watchers Oct. 16, 1989
3 - 5The Bonding Oct. 23, 1989
3 - 6Booby Trap Oct. 30, 1989
3 - 7The Enemy Nov. 06, 1989
3 - 8The Price Nov. 13, 1989
3 - 9The Vengeance Factor Nov. 20, 1989
3 - 10The Defector Jan. 01, 1990
3 - 11The Hunted Jan. 08, 1990
3 - 12The High Ground Jan. 29, 1990
3 - 13Déjà Q Feb. 05, 1990
3 - 14A Matter of Perspective Feb. 12, 1990
3 - 15Yesterday's Enterprise Feb. 19, 1990
3 - 16The Offspring Mar. 12, 1990
3 - 17Sins of the Father Mar. 19, 1990
3 - 18Allegiance Mar. 26, 1990
3 - 19Captain's Holiday Apr. 02, 1990
3 - 20Tin Man Apr. 23, 1990
3 - 21Hollow Pursuits Apr. 30, 1990
3 - 22The Most Toys May. 07, 1990
3 - 23Sarek May. 14, 1990
3 - 24Ménage à Troi May. 28, 1990
3 - 25Transfigurations Jun. 04, 1990
3 - 26The Best of Both Worlds (1) Jun. 18, 1990