The Macra Terror (Linking by Colin Baker)

1992 with linking narration from the Sixth Doctor, Colin Baker.

An exciting 'lost' television adventure starring second doctor Patrick Troughton with linking narration by Colin Baker.
The Doctor, Polly, and Ben visit a human colony that appears to be one big holiday camp. They soon discover, though, that its inhabitants have been brainwashed by the Macra, giant crab-like creatures who have taken over the colony. The humans are being forced to mine a gas that is essential for the Macra to survive, but fatal to them.

It's a scary race to rescue them, with Ben getting taken in by the Macra for a time, but eventually the time travellers manage to restore the colony's freedom.

1 out of 1 (100.0%) raters say this story requires a previous story.