once they land and discover the destroyed landing pod other, more cautious, Monoids revolt, sparking a civil war. The Doctor, Dodo and a Refusian use the confusion to steal one of the launchers and send the Refusian back to the Ark. The Monoids have placed a bomb on board the ship and plan to evacuate soon to the planet, leaving the humans to die. Word of this threat spreads and spurs a human rebellion. They discover that the bomb has been placed in the head of the statue, which the Refusian helps to dispose of into space before the bomb explodes. The humans now begin to land on Refusis themselves, having been offered support by the Refusians on the condition that they live peacefully with the remaining Monoids. Shortly after the TARDIS departs the Doctor becomes invisible in the TARDIS control room. Production Although Lesley Scott is credited as a co-writer, she does not appear to have done any actual work on the scripts. Her then-husband, Paul Erickson, requested that she be given a credit, but her name appears on no other related documents. A Lesley Scott was credited as a contributor to the Dr. Who Annuals published by World Distributors/World International, but it is not clear whether this is the same person. The Monoids were played by actors, each holding a ping-pong ball in his mouth to represent the alien's single eye. The upper portion of the actor's face was hidden by a wig. Cast notes Roy Spencer later played Frank Harris in Fury from the Deep (1968). Terence Bayler later played Major Barrington in The War Games (1969). Australian actor Bill Hunter played one of the Guardians; however, he remained uncredited. Richard Beale, who provided the disembodied voice of the invisible Refusian, later played Bat Masterson in The Gunfighters (1966). Michael Sheard made the first of six appearances in Doctor Who; he subsequently appeared in The Mind of Evil (1971) with Jon Pertwee, Pyramids of Mars (1975) and The Invisible Enemy (1977) with Tom Baker, Castrovalva (1982) with Peter Davison and Remembrance of the Daleks (1988) with Sylvester McCoy. Broadcast and reception Reviewing the serial in 2009, Patrick Mulkern of Radio Times stated, "The concept is fine, especially with the time-lapse cliffhanger to episode two ... Otherwise the plot is lacking in dramatic incident and there are often tracts of extreme tedium." He felt that the Guardians did