Clones

A scientist takes the brain of dead man and revives it via electrodes as it lays suspended in a tank of liquid. Soon, the brain grows to possess enormous psychic powers and inflicts its personality upon the doctor who saved it, creating a "Jekyll and Hyde" paradigm.

Aboard a small escape pod, four survivors try to discover what caused the destruction of their spaceship.

When an unidentified alien destroys three powerful Klingon cruisers, Captain James T. Kirk returns to the newly transformed U.S.S. Enterprise to take command.

Before the Doctor can settle down to married life, he must face one last confrontation with his deadly enemy of certain death - the Master.