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Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.
The Enterprise's newest passenger is a young man - what they don't know is that he has the power to make anything he thinks of happen.
While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives two crewmen godlike powers.
A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.
A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if the crew is unable to find a way to merge the two Kirks back together.
The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.
Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.
Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.
Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.
The Enterprise encounters a vast alien ship that sets out to test them.
Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.
Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.
Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.
Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.
The Enterprise crew take shore leave on a peaceful, pastoral planet... where their dreams and fantasies come to life.
Seven Enterprise crew members go on a shuttle mission with Spock in command.
The Enterprise discovers a rogue planet drifting through space, inhabited by an eccentric being named Trelane who uses his apparently unlimited power over matter and form to manipulate the crew.
A time accident leaves the Enterprise a UFO over 20th century Earth.
The Enterprise discovers a planetary population controlled by a powerful being called Landru. While investigating, Captain Kirk and his landing party are taken captive and discover that the Enterprise crew will be the next to be "absorbed" into Landru's control.
On Eminiar VII, the Enterprise finds a civilization at war with its planetary neighbor. Unable to discern any signs of battle from orbit, Captain Kirk leads a landing party to the surface where he discovers the entire war is fought by computer. Even though the war is simulated, citizens who are listed as virtual casualties still report to termination booths to be killed for real. After the Enterprise is destroyed in an attack simulation, Kirk must fight to keep his crew from death.moreless
The Enterprise visits a colony where floral spores bring peaceful contentment.