Written by Robert Holmes
"If this machine does run down, there will be the most colossal release of energy. Enough to destroy us, the Krotons and most of the planet!"
| Episode Title | Premiere Date |
| Episode 1 | 28/12/1968 |
| Episode 2 | 04/01/1969 |
| Episode 3 | 11/01/1969 |
| Episode 4 | 18/01/1969 |
When the TARDIS arrives on the planet of the Gonds, the Doctor, Jamie and Zoe discover a world ruled and enslaved by the Krotons. The brightest Gonds are always chosen to serve as companions of the Krotons and are never seen again. The Doctor and his companions decide to put a stop to their rule — but in doing so, inadvertently unleash the true power and terror of the Krotons instead...
Cast & Crew
The Doctor: Patrick Troughton
Jamie McCrimmon: Frazer Hines
Zoe Heriot: Wendy Padbury
Eelek: Philip Madoc
Beta: James Cairncross
Selris: James Copeland
Krotons (voices): Roy Skelton, Patrick Tull
Producer: Peter Bryant
Director: David Maloney
Scriptwriter: Robert Holmes
