Star Trek III The Search For Spock

The Genesis planet is undergoing some rather dramatic transformations, not all of which were expected. There is even a form of animal life somewhere on the planet that warrants further investigation. Saavik and David Marcus follow that lead, while a group of Klingons under the command of Kruge pursue the Genesis device for its application as a weapon. Finally, Spock's katra was transferred to McCoy, and Kirk and his command crew are dedicated to bringing Spock back whole.