He appeared in several horror films and was in Lawrence Olivier's Hamlet. As a Hammer Film actor, he portrayed Baron Frankenstein, Dr. Van Helsing, and Sherlock Holmes.
His first job was as a surveyor's assistant in Surrey, England.
He appeared in Star Wars and portrayed The Doctor in Dr. Who films in 1965 & 1966.
He married actress Helen Beck in 1943. Their marriage lasted until her death in 1970.
He became best friends with Christopher Lee.