The Decepticon leader Megatron returns from a three-year exile with a plan to exploit the properties of a mysterious substance called "Dark Energon", which has the ability to turn the bodies of dead Transformers into zombie-like Terrorcons. The Autobots storm an Energon mine in search of their lost comrade Cliffjumper, only to discover that his dead body has been revived as a ravenous zombie by Dark Energon. Debuts: William Fowler, June Darby, and Decepticon Miners

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