A Cyber-Scout's craft crashes in a jungle and encounters a village of humans, who believe it is a servant of the gods. Raven, a heretic, is selected by their religious leader to accompany the scout on its mission to find the Lizard Kings. At the edge of the Blisterlands, they encounter a cybernetic dinosaur which conveys them to the Dead Heart of the World, an underground base. Inside, they revive Kho'dja, an augmented Lizard King, who tells them the history of Mondas: the planet departed from its orbit when its sister planet gained its moon; the Lizard Kings dominated the world but became lazy and corrupt; they used their technology to augment apes into cybernetic servants; and, finally, they entered suspended animation until they world would return to its original orbit, but instead the apes have evolved and taken over. The Cyberman kills Kho-Dja, declares that Mondas will belong to the Cyber-race, and has Raven placed in a conversion unit.
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- This story connects Mondas departing its orbit (TV: The Tenth Planet) with Earth capturing the rogue planet which became its moon. (TV: Doctor Who and the Silurians)