The episodes are being presented in order of numbering. The airdates are in a slightly different order.

Episode Title: 'The Gamesters of Triskelion'
Synopsis: "Kirk, Uhura, and Chekov are dragged hundreds of light years away by the gambling leaders of the planet Triskelion, who force aliens to participate in combat to the death for their amusement. Kirk makes a bet with the aliens to win the freedom of all the thralls."

Episode Title: 'Obsession'
Synopsis: "Kirk meets up with a gaseous being that feeds on human blood cells, which he failed to destroy during an encounter years earlier, costing the life of his captain. Now, with that captain's son on the Enterprise, he becomes obsessed with the creature's destruction."

Episode Title: 'The Immunity Syndrome'
Synopsis: "When a huge single-celled alien saps the energy out of an entire solar system, the Enterprise must find a way to stop the creature's progress and prevent it from reproducing."

Episode Title: 'A Piece of the Action'
Synopsis: "A century ago, a Starfleet vessel left a book about Chicago mobs on a highly imitative planet. When the Enterprise checks up on the planet's development, they find a planet-wide gang war in progress and become caught in the middle."

Episode Title: 'By Any Other Name'
Synopsis: "The ship is taken over by a group of beings from the Andromeda Galaxy who have assumed human form in order to take the ship back to their own galaxy. Kirk and his crew devise ways to use their new sensual feelings against them."

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Keeper of the Jabberwock