Roche (The Suns of Caresh)

 was an Arcalian. After being hit by a bus, he regenerated into a body identical to the Doctor's third incarnation in an attempt to evade the Furies hunting him. He could swap mindscents with humans, effectively adopting their appearances for a short time, during which period they resembled him. Roche's TARDIS disguised itself as a shower cubicle and an ice cream van. (PROSE: The Suns of Caresh)