The Autobots & the Maximals find an artifact of great power called the AllSpark. It gave birth to all Cybertronians. They plan to use it to restore Cybertron. Galvatron returns and plans to kill Optimus Prime as revenge for killing him when he was Megatron. The Predacons, enemies of the Maximals, join with the Decepticons to destroy their enemies once & for all.
