In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.

The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.

Kirk and Spock must travel into the past in order to correct a change that will alter history.

The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.

A transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.

The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.

The starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.

Two powerful aliens threaten the well-being of the Enterprise and her crew.

A series of bizarre murders points to Mr. Scott as the prime suspect.

The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.

Strange incorporeal aliens threaten the Memory Alpha station and the Enterprise.