The Enterprise crew is trapped in paradise when they come to rescue colonists who have fallen to pacifying alien spores and become infected themselves.

The Enterprise encounters a vast alien ship that sets out to test them.

Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.

The crew of the Enterprise become entangled in a planet’s tribal power struggle.

First Officer Spock returns to his home world for a brutal Vulcan mating ritual.