 Three of the cast—Laurence Payne, Adrienne Corri and Lalla Ward—would be reunited in the 1980 season of the British sci-fi/fantasy series "Doctor Who" in the serial "The Leisure Hive".David Prowse, who later played Darth Vader in the first "Star Wars" trilogy, appears in a silent role as the circus strongman.Robin Sachs played the part of Ethan Rayne in "Buffy the Vampire Slayer" and as the space conqueror Sarris in the science-fiction comedy "Galaxy Quest".