The TARDIS arrives on the planet Pluto sometime in the distant future. Now surrounded by six artificial suns, Pluto is a thriving industrial planet, albeit one on which the leaders ruthlessly exploit the workers -- who bear a disturbing resemblance to Earthlings. In the course of exploring the planet, the Doctor (Tom Baker) and Leela (Louise Jameson) make the obligatory startling discoveries. A neat parable of modern-day urban paranoia, "The Sun Makers" was written by Robert Holmes. The first of the adventure's four episodes originally aired on November 26, 1977.