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The Monsterbots are a subgroup of Autobots so-called because their alternate forms resemble monstrous creatures.
Though they did not appear in The Transformers due to its cancellation, the Monsterbots were featured in the Japan-exclusive fourth season, Transformers: The Headmasters. They were initially assigned by their fellow Autobots to guard the Beastformers from future Decepticon predations, though the group-or at least Doublecross-were later recalled to Earth.