A good portion of the episode, including almost all of Part 2, was shot at Castaic Power Plant, just outside of Los Angeles. In his DVD commentary, writer, director and producer, Kenneth Johnson tells the audience how he used Castaic not only in this episode, but also in one of the more famous "The Incredible Hulk" episodes from 1980, "Prometheus." For whatever reason, Castaic Power Plant is not mentioned as a filming location in either "Doomsday Is Tomorrow" or "Prometheus."