Stingray (1964 TV series) to HO". The process of designing and making the puppets took four months and each of the main characters was sculpted in duplicate to allow two episodes to be filmed simultaneously using both puppet stages. The likenesses of some of the puppets were inspired by real-life actors: Titan was based on a young Laurence Olivier and Surface Agent X-2-0 on either Claude Rains or Peter Lorre. Troy Tempest was modelled on James Garner at Gerry Anderson's suggestion. Atlanta Shore has been likened to Lois Maxwell (who voiced the character) and Marina to both Brigitte Bardot and Ursula Andress. "Stingray" was
Things Which Have Never Yet Been Done was shot with a handheld camera by the episode's director, TJ Scott, with Maslany and Outerbridge improvising the dialogue and use of props. The subsequent shot of the barn on fire was created by the visual effects company Intelligent Creatures. The title of the final two episodes, "Things Which Have Never Yet Been Done" and "By Means Which Have Never Yet Been Tried", are taken from a Francis Bacon quotation in his philosophical work "Novum Organum": "It would be an unsound fancy and self-contradictory to expect that things which have never yet been done can be done except by means