In the conclusion of the four-part story "The Sun Makers," the Doctor (Tom Baker) and Leela (Louise Jameson) cast their lot with the Plutonian resistance movement dedicated to toppling Gatherer Hade (Richard Leech) and the despotic Usurians from power. Crucial to the success of the rebels is the destruction of the PCM plants, where the mind-controlling gases which keep the human laborers in bondage are manufactered. Another of Doctor Who's clever "labor vs. management" parables, "The Sun Makers, Episode 4" was written by Robert Holmes, and was first telecast on December 17, 1977. ~ Hal Erickson, Rovi