Sinnertwin

Prowls the perimeter of the Terrorcons' lair looking for trouble—and hoping to find it! Then he can show off his razor-sharp teeth, piercing pronghorns, and steel-shredding claws. Has flame cannon and flame breath in creature mode, armor-piercing rocket-grenade launcher in robot mode. Unnerved by small creatures like mice, insects, and mini-droids.

(Source: Wikipedia)