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Jax the Conqueror is a warlord who despises Martians, but after being defeated and imprisoned by B-Bop and the others pretends to be willing to help them invade Earth to get a chance for revenge. He pilots a ship called the Doom Jax which is impervious to Martian weaponry. He has been "destroyed" three times in the series run, but always manages to come back.

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