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Headlock is the Mini-Con manager of Groundpounder, who along with his protege was imprisoned aboard the Alchemor for cheating during the Kaon gladitorial games. Escaping after the ship crash-landed on Earth, the pair became involved in a demolition derby, where Headlock was mistaken for a remote-controlled robot manipulated by Groundpounder's nonexistent driver. Headlock later reverted to his old tricks when Groundpounder faced Grimlock in battle, only to face battle himself in the form of Fixit. Headlock and Groundpounder were soon defeated and reimprisoned; when Steeljaw later freed Groundpounder, Headlock was left behind.