For millennia, the heroic Autobots, led by Optimus Prime (Peter Cullen), have been at war with the evil Megatron (Frank Welker) and his Decepticons over control of their home planet of Cybertron. However, an even greater threat - Unicron (Orson Welles, Citizen Kane), a colossal converting planet that devours everything in its path - is heading right for Cybertron. The only hope is the Autobot Matrix of Leadership. Will the Autobots be able to save themselves and their home world in time? An all-star cast, including Judd Nelson (The Breakfast Club), Leonard Nimoy (Star Trek), Eric Idle (the Monty Python films), and Robert Stack (The Untouchables), brings this inimitable, explosively entertaining Autobot adventure to life.