Back on Cybertron, there was a war between Autobots and Decepticons and the Autobots thought of Freedom. Now there was a match between Autobots and Decepticons and the Autobots were outnumbered but there is one Autobot ship that escaped called the Ark, which was carrying a secret cargo for their planet change. The Ark disappeared in space and crashed on the moon during in 1969. On Earth, the Autobots discover that the Ark is on the moon and Optimus and Ratchet enter it and find Sentinal and pillars. The pillars have the abilities of all transformers, ships and fighters that were on the moon. Till one day, Sam learned about the Decepticon plans and Sentinel betrays the Autobots because he made a deal with Megatron for the survival of the Cybertronian race. So the Autobots have been forced to leave Earth but it was a trap and Starscream shut down the Autobots ship. After the Decepticons invade Chicago, the Autobots are still alive and showing the humans that the Decepticons are untrustworthy. So Sam goes into Chicago to rescue Carly his girlfriend because she is the only one who knows about the Decepticons’ plan to bring the planet Cybertron to Earth using their resources to rebuild their home and enslave humanity. Now, Optimus, Autobots and their Allies just defeat Shockwave and most of the Decepticons and after Optimus shut down one of the control pillars, then he is going to face Sentinel. On the bridge, Optimus and Sentinel are still fighting when Megatron just joins the fight and attacks Sentinel. He wants to be the leader of the Decepticons and truth but Optimus refuses and attacks and kills Megatron. He kills Sentinel for betraying him. Before that happened Ratchet and Bumblebee just destroyed the control pillar which caused their home planet Cybertron to self-destruct, creating worm hole. Now the battle of Chicago is over.