Christopher Robbie (born 30 May 1938[1]) appeared in two Doctor Who television stories: as the Karkus in The Mind Robber and the Cyber-Leader in Revenge of the Cybermen.
He shared his memories on his two stories on the 20th edition of Big Finish's charity podcast series Toby Hadoke's Who's Round (which was released on his 75th birthday), as well as the documentaries The Fact of Fiction and The Tin Men and the Witch (Blu-ray version).