 The episode also featured a guest appearance by William MacDonald as FBI Agent Nolan; MacDonald would later reappear in the third season episode "Through a Glass Darkly".Lance Henriksen performed all his own stunts in this episode, having been introduced to acting by a stuntman friend of his.The episode opens with a quote from French existentialist philosopher and writer Jean-Paul Sartre—"I am responsible for everything... except my very responsibility", which was taken from the 1943 treatise "Being and Nothingness".