Timelord

A type of alien from the planet gallifrey. When injured badly they can regenerate, but regenerating causes them to change face and body. They look like humans. They have two hearts. They can live forever. They have a maximum of 12 regenerations. They can only be killed if you fight them while they are regenerating. Timelords are now almost extinct. There is only one Timelord left. His name is The Doctor. They are very intellegent and are usually seen travelling around in a TARDIS (time and relative dimensions in space)