The Doctor can only "turn human" with the aid of the Chameleon Arch. It has not been established whether it serves any other purpose, i.e. whether it can be used to change a human into a Gallifreyan or a Dalek.
Advertisement
The Doctor can only "turn human" with the aid of the Chameleon Arch. It has not been established whether it serves any other purpose, i.e. whether it can be used to change a human into a Gallifreyan or a Dalek.