Star Trek: The Original Series

A shape-shifting, salt-craving creature terrorizes the crew of Enterprise.

A powerful teenage boy wreaks havoc aboard the U.S.S. Enterprise.

Kirk's friend, Gary Mitchell, is transformed into a god-like being.

The Enterprise crew catch a virus that removes their inhibitions.

A transporter malfunction creates an evil Kirk.

The Enterprise rescues con artist Harry Mudd and his "beautiful" female cargo.

Nurse Chapel's long-lost fiancé is found - along with his androids.

A strange group of children are discovered on an Earth-like planet.

A new treatment for the criminally insane has deadly results.

Kirk bluffs his way past what appears to be a powerful alien.

Spock hijacks the Enterprise to return an injured Captain Pike to Talos IV.

Spock hijacks the Enterprise to return an injured Captain Pike to Talos IV. Part 2 of 2

Kirk suspects Shakespearean actor Anton Karidian as a mass murderer.

After attacking an outpost, Romulans battle the Enterprise.

On shore leave, the crew's thoughts come to life.

Seven Enterprise crew members go on a shuttle mission with Spock in command.

A powerful entity known as Trelane torments the crew of the Enterprise.

Kirk is pitted in a barehanded duel with a Gorn.

The Enterprise is thrown back to 20th century Earth.

Kirk is recalled for a potential court-martial.

The Enterprise crew finds a world run by a computer named Landru.

Kirk meets Khan, a leader of Earth's Eugenics War.

The Enterprise is diverted by two planets fighting a computerized war.

The Enterprise visits a colony where indigenous flower spores provide the settlers with peaceful contentment.

An unknown monster threatens a mining operation.