Guiltaur, also known as the "Great-Gun Soldier", is a bizarre, vicious fusion of Optimus Prime and Megatron, sent to attack both Autobot and Decepticon alike. It is ultimately a lifeless shell created by the Quintessons, animated by the "ghost" spark of Starscream. It has a massive artillery truck mode, as well as multiple gun configurations for its robot mode. Physically, it can hold its own against many of the toughest Transformers.