Despite exposure to fatal radiation the Federation colony on Omicron Ceti III appears to be thriving. A landing party from the Enterprise investigates, finding the colony’s population to be healthy beyond explanation.

Dispatched to the mining colony on Janus VI, is tasked to investigate rumors of a strange, subterranean creature responsible for destruction of equipment and the deaths of fifty miners.

Peace negotiations have collapsed between the Federation and the warlike Klingon Empire. The Enterprise is ordered to protect Organia, a peaceful planet located near the Klingon border. Kirk and Spock beam to the surface to warn the Organians about the Klingons, but

After accidentally overdosing on a powerful stimulant, Dr. McCoy becomes unbalanced and disappears through the guardian of forever, a newly discovered time portal on a remote planet. Kirk and Spock follow after learning that McCoy somehow changed history, removing everything they

 The Enterprise arrives at Deneva – the home of Captain Kirk’s brother, Sam and his family – and discovers that the entire planet has been infested with large, Amoeba-like aliens that have attacked and killed much of the human

During a historical research mission in 1968, the Enterprise encounters Gary Seven, a human from the future who appears to be attempting to alter history

The crew of the Enterprise visits a planet dominated by a Nazi culture and at war with its planetary neighbor.

Beings from the Andromeda Galaxy steal the Enterprise, technologically modify it, and attempt to return home.

Captain Kirk must battle a deadly virus and a treacherous fellow starship captain to stop a meaningless intertribal war.

A new computer system causes havoc while being tested aboard the Enterprise.

Captain Kirk and his companions are forced to fight in gladiatorial games on a planet modeled after the Roman Empire.

Captain Kirk, Chekov and Uhura are kidnapped by powerful disembodied aliens and forced to fight in gladiatorial contests for the aliens’ gambling entertainment.