The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.

The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.

The USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.

Kirk, McCoy, and Sulu are stranded on a barren planet where a mysterious woman attempts to kill them one at a time, while the Enterprise must travel halfway across the galaxy to rescue them.