To indicate to viewers that Austin was using his bionic enhancements, sequences with him performing superhuman tasks were presented in slow-motion and accompanied by an electronic "dit dit dit dit" sound effect. (This characteristic sound effect was actually first used in season 1 episode 4, "Day of the Robot", not during use of Austin's bionics but with the robotic clone of Major Fred Sloan, played by actor John Saxon, during the final fight scene.) When the bionic eye was used, the camera zoomed in on Austin's face, followed by an extreme close-up of his eye; his point of view usually included a crosshair motif accompanied by a beeping sound-effect. In early episodes, different ways of presenting Austin's powers were tested, including a heartbeat sound effect that predated the electronic sound, and in the three original made-for-TV movies, no sound effects or slow-motion were used, with Austin's actions shown at normal speed (except for his running, which used trick photography); the slow-motion portrayal was introduced with the first hour-long episode, "Population: Zero."