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The Enterprise encounters a vast alien ship that sets out to test them.
Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.
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.moreless
Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.
The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.
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.moreless
A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.
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.
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.