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On a mission to 1960s Earth, the Enterprise finds a human agent (Robert Lansing) working for aliens; guest Teri Garr.

Star Trek

Assignment: Earth

The Enterprise discovers the wreckage of a Federation vessel in orbit around an Earth-like planet where a gladiator-type empire continues to flourish.

Bread and Circuses

A supercomputer with a mind of its own controls the Enterprise during a battle exercise; guest William Marshall.

The Ultimate Computer

A mad starship captain (Morgan Woodward) thinks he has discovered immortality on a war-ravaged world.

The Omega Glory

A band of hostile aliens from the Andromeda galaxy uses a distress signal to lure the Enterprise into a trap.

By Any Other Name

Kirk discovers his old professor is responsible for establishing a Nazi society on a planet; guest Skip Homeier.

Patterns of Force

Kirk, Spock and a scientist (Diana Muldaur) temporarily allow a trio of aliens to inhabit their bodies.

Return to Tomorrow

A power struggle between the Federation and the Klingon Empire ensnares a primitive society Kirk once visited.

A Private Little War

The disappearance of a Vulcan ship leads a weary Enterprise crew into battle with a huge space organism.

The Immunity Syndrome

The Enterprise discovers a remote world bearing an unlikely resemblance to 1920s Chicago; guest Vic Tayback.

A Piece of the Action

The rulers of the world Triskelion kidnap Kirk, Uhura and Chekov and force them to fight in wagered bouts.

The Gamesters of Triskelion

Ravenous, furry tribbles, irate officials and hostile Klingons complicate an Enterprise cargo delivery.

The Trouble With Tribbles

The crew of the starship USS Enterprise, commanded by the charismatic Capt. James T. Kirk with half-human/half-Vulcan First Officer Spock, boldly explores outer space and encounters a wide variety of alien life forms in the 23rd century.

S2 E21 | Patterns of Force

E26 | Assignment: Earth

E25 | Bread and Circuses

E24 | The Ultimate Computer

E23 | The Omega Glory

E22 | By Any Other Name

E21 | Patterns of Force

E20 | Return to Tomorrow

E19 | A Private Little War

E18 | The Immunity Syndrome

E17 | A Piece of the Action

E16 | The Gamesters of Triskelion

E15 | The Trouble With Tribbles