A chameleon Arch was a type of Time Lord technology that could turn someone into something else (e.e. A Time Lord into a Human.) The Doctor used a Chameleon Arch to change to a human while on the run from the the dreadfull Family of Blood.
A chameleon Arch was a type of Time Lord technology that could turn someone into something else (e.e. A Time Lord into a Human.) The Doctor used a Chameleon Arch to change to a human while on the run from the the dreadfull Family of Blood.