Ronnu Thanjess

Ronnu Thanjess was the brother of Briak Thanjess who together ran a used spaceship business. When Ronnu stole the Tenth Doctor's parked TARDIS and sold it to the dangerous criminal Ludo Faltrati, his brother was beaten up because it didn't work. Ronnu had to go with Ludo and when the Doctor and Heather turned up and fix the TARDIS a short trip into the future led him to being arrested by the police, along with Ludo, but he was grateful for still being alive. (DWAM: One Careful Owner)