The Autobots have been living with humans for years now. Sam has been having a strained relationship with Carly after the return of Mikaela. Bumblebee is still living in Sam's garage, and Optimus Prime talked to the President, and obtained a secret file about a certain star explosion. He reads the file to the Autobots, now Optimus, Bumblebee, Prowl, Wheeljack, Skids, Mudflap, Ratchet, Bluestreak, and new weapons specialist Inferno. Little do they know, the new Decepticons, Shockwave, Galvatron, Lord Straxus, Starscream, Thundercracker, Skywarp, Brawl, Scorponok, and Ravage, are planning to bring back Megatron. They steal Wheelie, and take his life force to power Megatron. They find part of a Cybertronian First Aid from the explosion of Cybertron, and use it to reconnect Megatron's head. They still need part of an All-Spark, whcih has been destroyed for years. They find Sam Witwicky, and take his grandfathers glasses, hoping they will give enough AllSpark power. They smash up the glasses, and use the powder to revive Megatron. Megatron uses 4 of the remaining piles of powder, which is five piles, to revive Devastator, Barricade, The Fallen, and Demolisher. The last pile of powder is stolen from the Decepticons by Prowl. The Autobots use it to revive Ironhide. Inferno relinquishes the Weapons Specialist job back to Ironhide, and the Autobots are getting ready to blast off to the exploded star. The file said that a star unusually exploded immediately after being born. The Government realized this happened because of an unusual alien ship crashing into it. After the Transformers arrived on Earth, the Government concluded that it was a Cybertronian craft that crashed. The Autobots fly into space, and find the spacecraft. They find only one surviving Autobot. The rest were dead. The Autobot is named Arcee. They return to Earth, with the last remaining peice of the Cybertron Life Force. Optimus uses it to bring back Primon, the first known Prime. The Decepticons head to Russia, and are followed by the Autobots. Seymour, Sam, Carly, and Mikaela. They bring William Lennox and his military troops. Sam and Mikaela talk on the way there, how Mikaela dumped Sam after Sam is not able to get a job. Carly walks in and tells Sam she cannot take all this action and seeing robots every day. She says after this is over, she's leaving to Japan. They land near Egypt, and Carly climbs onto a helicopter heading for Japan. The others keep heading for Russia. They land near where the Decepticons are, and the Autobots start off to where they are. The Autobots start fighting with the Decepticons, and the military arrives to help. The Autobots take down Lord Straxus, and the military starts working on taking down Galvatron. Ironhide takes down Brawl easily, and Optimus engages in battle with Megatron. Thundercracker gets taken down by Starscream, after he questions why he's a Decepticon. Optimus gets an idea, and they turn the Decepticons against each other. Devastator takes down Shockwave, Demolisher takes down Skywarp, Scorponok takes down Barricade, Ravage takes down The Fallen(He's much weaker), and Galvatron takes down Starscream. The remaining Decepticons are told of the Autobots' plan after Megatron tells them. The Military takes down Scorponok, and stand back so the Autobots can kill the rest. Sam and Mikaela run in and use some AllSpark scraps Sam found to take down Ravage and Galvatron. Prowl, Bumblebee, Ironhide, Skids, Mudflap, and Inferno all work together to take down Devastator, and Ratchet, Wheeljack, Bluestreak, and the revived Wheelie defeat Demolisher. Optimus fights Megatron, and defeats him, cutting him to pieces. The pieces are scattered all over the world, and the Decepticons are defeated. Sam and Mikaela talk, and get back together. The Autobots, Sam, Mikaela, and the military all head back to the US, and everything's back to normal.