Filming began on 20 February 1967 and was completed in two weeks. One of the medical students that appear in the opening scene was played by a puppet that was originally sculpted as the prototype of Captain Scarlet. The episode's incidental music was recorded in a four-and-a-half-hour studio session held on 14 May 1967, where it was performed by a group of 12 instrumentalists conducted by series composer Barry Gray. The music for "Renegade Rocket" was recorded during the same session.