Essentially a movie involving the battle between the heroic Autobots and the evil Decepticons, two warring factions of transforming robots from the planet Cybertron, the plot also involves the giant planet named Unicron, who's ready to consume anything that stands in its way. The only thing that can stop Unicron is the Autobot Matrix of Leadership, which is possessed by the Autobots and which the Decepticons, through Unicron's orders, plan to take away from them ...