"The Changing of the Guard" is an episode from the third season in which a professor is visited by the ghosts of his former students, all who died heroically. Do you know which actor played the professor?

Donald Pleasence was an English actor whose career began on stage in West End. He is best known for his role in The Great Escape alongside Steve McQueen.

Asked by Vasilii Kulev · Last updated 5 years ago · 1.9K views · SOURCE