The Doctor is a friendly NPC who can be spawned by using the TARDIS Key. When he is slain, he will 'regenerate' into his second body, who, when killed will 'regenerate' into his third, and so on. When the 11th incarnation is killed, however, he will die for good, and another Doctor will have to be spawned using the TARDIS Key.
Using the TARDIS Key
Once the Doctor has regenerated into his second body, another 'original' Doctor can be spawned
- The remaining Doctors were added
- The First and Second Doctors were added
- The 11th Doctor was added