If he is a ghost, then it's very disappointing for me, because he is banished in the story, and that could mean that he won't be coming back, and that would be terrible, wouldn't it?

Paul Darrow (born Paul Valentine Birkby on 2 May 1941) is an English actor best known for his portrayal of Kerr Avon in the BBC science fiction television series Blake's 7. He also guest starred twice on Doctor Who playing Captain Hawkins in the serial Doctor Who and the Silurians which was transmitted in 1970 and Maylin Tekker in the serial Timelash which was transmitted in 1985.