Optimus Prime and the Autobots defend Earth against Megatron and combined forces of the evil Predacons and Decepticons.Optimus Prime and the Autobots defend Earth against Megatron and combined forces of the evil Predacons and Decepticons.Optimus Prime and the Autobots defend Earth against Megatron and combined forces of the evil Predacons and Decepticons.