Optimus Prime swore long ago to defend freedom against evil warriors like the devious & deadly Starscream. Starscream knows that if he can catch the Autobot leader by surprise, nothing will be able to stop him from ensuring a permanent Decepticon victory. Pit Optimus Prime & Starscream against each other in one smashing, bashing brawl after another! Attach your robots to their bases, then connect the bases. Switch your robots to vehicle mode for a new kind of battle, & then back again. On the count of three, you & your opponent will press the triggers, & the fight is on! When one robot or vehicle knocks the other off its base, the fight is over