Howard Anderson could not keep up with the filming and special effects needs for regular production, so producers hired several other studios to contribute effects and additional footage. Motion control equipment was too expensive, so the ship was filmed with stop motion. Filming was often delayed by the heat generated by the studio and model's lights. Special effects were produced as cheaply as possible. Most third-season footage of the "Enterprise" was reused first- or second-season footage. Animators for "" (1973–75) rotoscoped "Enterprise" footage to recreate the ship's movements, contributing to the impression of the animated series being a fourth season of the original. The animated medium could not support some of the ship's lighter colors, so the "Enterprise" was depicted as a consistent gray.