Doctor Who: The Krotons 55 years old

The TARDIS arrives on the unnamed planet of the Gonds, who are ruled and taught in a form of self-perpetuating slavery by the alien Krotons — crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years earlier after being damaged in a space battle. The Krotons are in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, nominally to become "companions of the Krotons", but in truth to have their mental energy drained, after which they are killed.

Credits

Doctor Who: The Krotons Cast

Name	Character
Patrick Troughton He was 48, 67 years old when he died	as The Doctor
Wendy Padbury She was 21, now 76 years old	as Zoe Heriot

Doctor Who: The Krotons Crew

Name	Department