As the Decepticons steal energy from the island to fill energon-cubes, it disrupts the time-space continuity causing other timewarps to appear at random across the world. The Autobots have to send woolly mammoths, cowboys and other historic relics back through the timewarps before they are trapped in modern day.
The Autobots eventually figure out the cause of the timewarps and send a force to stop The Decepticons on Dinobot Island. They arrive on the island, but are taken out rather handily. All does not look well until the Dinobots revive and stop the Decepticons. Optimus Prime sees they have learned to function better as a group and allows them to return to the Autobots.