Filming began on 25 October 1967, less than three weeks before "Joe 90", Century 21's next series, entered production. To avoid overworking the designers, who were busy preparing for the new series, the episode was devised as a bottle show to reduce the number of puppets and sets required: unique among "Captain Scarlet" episodes, it features no characters other than the regular cast and was filmed mostly on existing sets. The previously unseen Cloudbase Radar Room was created using walls and props that were originally built for "Thunderbirds Are Go" (1966) and earlier "Captain Scarlet" episodes. "Attack on Cloudbase" is also one of only two episodes (the other being "Flight to Atlantica") to feature all of the regular cast, though not all of them have speaking parts.