The Magnacopter, which does not appear in any other episodes, was designed by Mike Trim, assistant to effects director Derek Meddings. The interiors were built by Century 21's art department, who according to Trim were rarely able to replicate the curves of his scale model designs as they made their sets largely out of "flat sheet" materials of limited malleability. Rather than build a brand-new set for the Magnacopter's cockpit, the art department chose to save time and money by adapting an existing set that had previously appeared in "Thunderbirds". Trim was forced to alter his design, which originally had a more aerodynamic look, to match the lines of this set.