Torm

Torm was the home planet of Rascla and the Tormian Toad-men. Rascla was determined to conquer the universe and selected the Mitrans as his first target. He experimented with acidic warfare, causing damage to the planet's surface.

The Doctor's TARDIS was forced to land on Axa, the moon of Torm, and from their the Fourth Doctor, Sarah Jane Smith and Harry Sullivan were brought to Torm. Using a Nucleonic Body Separator, Rascla possessed the Doctor and left Torm. He died shortly after, so he did not return. (DWAN: The Body Snatcher)