크레딧 출연 Tom Baker The Doctor Elisabeth Sladen Sarah Jane Smith Ian Marter Harry Sullivan Nicholas Courtney Brigadier Lethbridge-Stewart John Levene RSM Benton John Woodnutt Duke of Forgill / Broton Keith Ashley Zygon Ronald Gough Zygon Lillias Walker Sister Lamont Angus Lennie Angus Tony Sibbald Huckle Hugh Martin Munro Robert Russell The Caber 스텝 Douglas Camfield Directing Robert Banks Stewart Writing Robert Holmes Writing Philip Hinchcliffe Production Geoffrey Burgon Sound Sylvia James Costume & Make-Up