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In the third episode of the seven-part story "Inferno," the Doctor (Jon Pertwee) has piloted his TARDIS into an alternate universe, where England is ruled by fascist dictatorship. Even so, Project Inferno, the government's effort to find new energy resources at the center of the earth, goes on unabated, just as it had been doing in the "real" universe. But will this project prove to be a benefit to mankind -- or will it bring about the destruction of the earth? Written by Don Houghton, "Inferno, Episode 3" first aired on May 23, 1970.