"Frontios buries its own dead", or so the saying goes. The Doctor, Turlough and Tegan are forced into landing on the remote planet of Frontios, a human colony where deaths go unaccounted for.

The Fifth Doctor made the same request to the colonists of Frontios in the far, far future (see 1984's Frontios). It's not the first time he's abandoned a population to it's historical fate ...