Jax the Conqueror

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.