Xeriphas

Xeriphas is the homeworld of the psychic Xeraphin race. 140,000,000 years ago, Xeriphas was caught in the cross-fire of the Vardon-Kosnax War and devestated by radiation. Fleeing, the Xeraphin merged into a gestalt and left in a starship for Earth.

By the early 1980s Xeriphas had returned to a normal state and the Doctor returned the Xeraphin to their home. (DW: Time-Flight)