Michael Westmore designed the make-up in the episode, drawing inspiration from an alligator he saw in "National Geographic" magazine to create Tosk's appearance. The Hunters were initially intended to appear more alien-like, with steam rising out of their masks as they opened to reveal a demonic face with huge eyes and scaly skin. However, due to budgetary restraints, the original costume and make-up plans were scrapped and the description was revised to become "a rather mundane humanoid face, not far off human." The transporter effect used by the Hunters was inspired by the science fiction film "Metropolis" (1927), specifically by the scene in which the robot Maria undergoes a transformation.