Sillarc

Sillarc was a reptilian humanoid who once tried to steal a TARDIS from Gallifrey.

His plan involved using an hypnotic device to distract the Time Lords while he stole a TARDIS. Like the Monk, he wanted to use the stolen time capsule to plunder all of time and space.

The TARDIS he chose was being repaired by Plutar and could only move in time, not space. Thus, he was only able to transport himself and the unsuspecting repair technician back to Gallifrey's distant past. There, they narrowly escaped being killed by Gargantosaurs. After returning to the 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 banished from Gallifrey. (DWM: The Stolen TARDIS)