In the second episode of the four-part story "The Sun Makers," the Doctor (Tom Baker) and Leela (Louise Jameson) have arrived on Pluto in the distant future, only to discover that the previously stone-cold planet is throughly inhabitable thanks to artificial sunlight. On a less positive note, the dictators leaders of Pluto have industrialized the planet by using as slave labor the last remnants of the Earth's population. In attempting to put an end to the overlord's tyranny, the Doctor is himself exposed to the fear-inducing gases which hold the workers in bondage. First telecast December 3, 1977, "The Sun Makers, Episode 2" was written by Robert Holmes. ~ Hal Erickson, Rovi