Spock must take a bride (Arlene Martel) on his home world or die when the Vulcan mating cycle overwhelms him.
A being, claiming to be the Greek god Apollo, wants the adoration of the Enterprise crew; guest Leslie Parrish.
The space probe Nomad, its programming altered in an encounter with an alien device, mistakes Kirk for its creator.
Kirk, Scott, McCoy and Uhura accidentally switch places with their malevolent counterparts from a parallel universe.
The Enterprise officers investigate a primitive society that seems to exist to serve a godlike machine; guest David Soul.
Only the Enterprise and the battered Constellation stand between an ancient weapon and devastation; guest William Windom.
A beautiful sorceress (Antoinette Bower) and her accomplice use illusion to hold Kirk and the Enterprise captive.
Kirk encounters old foe Harry Mudd (Roger C. Carmel), now apparently the monarch of a world populated by androids.
The shuttlecraft Galileo makes a forced landing on a world with a single human inhabitant (Glenn Corbett); guest Elinor Donahue.
Spock's father (Mark Lenard) faces charges of killing a fellow ambassador during an Enterprise voyage; guest Jane Wyatt.
A fiery, pregnant woman (Julie Newmar) complicates Kirk's negotiations with the warlike Capellans; guest Tige Andrews.
A disease that caused the rapid aging and death of a planetary survey team threatens the Enterprise officers.
Kirk attempts, at any cost, to destroy a vampiristic creature he met before as a young officer.
Scott is suspected of several murders on a peaceful world during the shore leave of Enterprise crew members.
Ravenous, furry tribbles, irate officials and hostile Klingons complicate an Enterprise cargo delivery.
The rulers of the world Triskelion kidnap Kirk, Uhura and Chekov and force them to fight in wagered bouts.
The Enterprise discovers a remote world bearing an unlikely resemblance to 1920s Chicago; guest Vic Tayback.
The disappearance of a Vulcan ship leads a weary Enterprise crew into battle with a huge space organism.
A power struggle between the Federation and the Klingon Empire ensnares a primitive society Kirk once visited.
Kirk, Spock and a scientist (Diana Muldaur) temporarily allow a trio of aliens to inhabit their bodies.
Kirk discovers his old professor is responsible for establishing a Nazi society on a planet; guest Skip Homeier.
A band of hostile aliens from the Andromeda galaxy uses a distress signal to lure the Enterprise into a trap.
A mad starship captain (Morgan Woodward) thinks he has discovered immortality on a war-ravaged world.
A supercomputer with a mind of its own controls the Enterprise during a battle exercise; guest William Marshall.
Kirk, Spock and McCoy are captives on a version of Earth combining the 1960s with ancient Rome.
On a mission to 1960s Earth, the Enterprise finds a human agent (Robert Lansing) working for aliens; guest Teri Garr.
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