The Responsibility Seat

After a UFO inexplicably destroys itself less than two miles from Moonbase, a mysterious crystal rock is recovered, causes the person in its vicinity to hallucinate. The rock is eventually transferred to Straker's office, where he hallucinates that SHADO is simply a set for a TV series, he is an actor named Mr. Burns, Moonbase can be reached by stepping through two doors from the main control room at SHADO HQ, and 'Mr. Straker' is not available.