Director Alan Perry served as Captain Scarlet's body double for a close-up shot of Goddard jabbing a gun into the character's back, as well as for a scene in which the incarcerated Scarlet picks up a spear to hit against the dungeon ceiling, drawing the attention of Morton. Commentators Chris Drake and Graeme Bassett note the mixture of live action and puppetry in the dungeon scenes, which creates forced perspective. Two small mice were added to the puppet set; doubling for rats, they were the only live animals to be used with puppets on "Captain Scarlet".