Tarrant and Vila are sent to pick up a scientist whose cybernetic genius could help the crew of Scorpio fight the Federation, but they slowly begin to uncover the truth – the cybernetic progeny of Muller, a student of Orac’s creator, has assumed its creator’s identity and is on a murderous rampage to find the only other computer worthy of its attention and join with it: Orac.
written by Roger Parkes
directed by Mary Ridge
music by Dudley Simpson
Cast: Paul Darrow (Avon), Michael Keating (Vila), Steven Pacey (Tarrant), Josette Simon (Dayna), Glynis Barber (Soolin), Peter Tuddenham (Orac, Slave), John Westbrook (Muller), Lynda Bellingham (Vena), Douglas Fielding (Technician), Nick Joseph (Android), Lesley Nunnerley (Voice)
LogBook entry by Earl Green