Azal

Stephen Thorne specialised in prosthetics. His first role was as the Daemon Azal in The Dæmons. Then two years later he was the wounded and forgotten Time Lord Omega in The Three Doctors. In the following episode of the same series, Frontier in Space, he was an Ogron. Finally, in 1976 he was the male form of Kastrian Eldrad in The Hand of Fear.

Omega

Ogron

Eldrad