Hauler was a Constructicon involved in the building of the Crystal City. When Emperor Prime attacked them, his teammates managed to escape, but Hauler was captured and reprogrammed as an Autobot. Hauler grew to love being an Autobot, joining their ranks and eagerly participating in Prime's orgy of destruction. He helped design the Ark for Earth's conquest, and he is currently assigned to the Omega Doom project. When not building attack craft and weapons of mass destruction, he resumes his primary function: the discovery and procurement of energy sources. This task sends him far and wide across the planet, and his tendency towards capricious self-expression often results in him coming back with different colors and parts, usually harvested from unsuspecting neutrals he's killed.