Sillarc

Sillarc was a reptilian humanoid. He arrived on Gallifrey in his spacecraft and used a hypnotic device to distract the Gallifreyans while he stole a TARDIS, intending to use it to plunder all of time and space. The one he chose was being repaired by Plutar and could only move in time, not space. They were both transported back to Gallifrey's distant past, where they narrowly escaped being killed by Gargantosaurs. After returning to their present, Sillarc used the TARDIS to travel back in time again and moved it so that it would rematerialise on board his spacecraft. However, Plutar and armed guards were waiting for him and he was arrested. His memories were wiped and he was exiled. (DWM: The Stolen TARDIS)