Shortly after the animated "Star Trek" went off the air, pre-production began on '. Ken Adam and Ralph McQuarrie designed a new "Enterprise" with a triangular hull that later inspired the appearance of the eponymous ship in "." "Planet of the Titans" was dropped in favor of a return to television with ', for which Jefferies designed a new "Enterprise".' He began with the original design and identified components, such as the engines, that would have been upgraded. Some components, like the sensor dish, would move inside the ship to be more easily serviced. Abandoning "Phase II" in favor of producing ' (1979) necessitated additional "Enterprise" redesigns because the film medium would resolve more detail than television. One of the most difficult challenges facing the film producers was recreating the "Enterprise" for film. As Roddenberry told "Cinefantastique", the changes to the "Enterprise" would be explained within the story as the outcome of a major refit.