Here's the plot summary of the supposedly ''leaked'' Transformers 3 Script about time travel. In retrospect, there are some similarities between this and Transformers: Dark of the Moon. Three years after the battle in Egypt, the humans are aware of the Transformers' existence. Optimus Prime has ordered a new team of Autobots to come to Earth to act as embassadors of good-will between the two races, but Megatron has also ordered more Decepticons to come to Earth in order to undermine the Autobots' efforts to advance Earth's non-military technology and stockpile Earth's natural resources to be used to their advantage. As a result, the humans blame the Autobots for bring their war to their world and demand their departure. Optimus visits Sam Witwicky and Léo Spitz in the Large Hardron Collider Center in Switzerland, where he is informed by their boss, Dr. Immanuel Boussard, that an Allspark fragment was found in Mission City and they discovered that, bombarding it with 30% of the LHC's power, it can produce massive amounts of Energon. Optimus contacts Cybertron and orders scientists Wheeljack and Perceptor to come to Earth in the Ark to help the humans study the fragment. The Aerialbots led by Silverbolt and formed by Fireflight, Slingshot, Skydive and Air Raid are tasked with protecting the Ark from possible Decepticon attacks. Laserbeak infiltrates the LHC Center and discovers about Optimus' plan, which her relays to Soundwave, who detaches himself from NEST's satellite and meets Megatron, Starscream, Thundercracker and Skywarp at the Nemesis and informs them of Sam's discovery. Megatron contacts the Combacticons led by Onslaught and formed by Blast Off, Vortex, Brawl and Swindle, ordering them to destroy the Autobots and steal the Energon generator. Onslaught advices Megatron to wait for the Autobots to complete the Energon generator and then attack, to which Megatron agrees. Meanwhile, Sam invites Mikaela Banes to visit him, planning to ask her to marry him. When the Ark arrives, piloted by Mirage and Hound, Sam, Mikaela, Léo and Boussard board the ship with Optimus, Bumblebee, Ratchet and Ironhide. There, Wheeljack and Perceptor start to produce Energon from the Allspark fragment, while Sam and Mikaela have a picnic, where Sam proposes to her. Suddenly, the Nemesis attacks and a dogfight ensues. During the battle, the Ark is damaged and the generator overloads, producing more than 30% of energy. As a result, a time rift is opened and both ships go through it, emerging in 1982. The Nemesis crash-lands in the ocean, while the Ark crash-lands on a mountain. At the Nemesis, Starscream finds Megatron mortally wounded by a large metal spike and uses it to stab him to death. The United States Air Force deploys three F-15s to investigate the crash. Starscream destroys them, adopts the alt-mode of one of them and goes to Hoover Dam, where he destroys Sector Seven's headquarters and steals the Allspark. He attempts to kill 1982's Megatron, still frozen, but the dam breaks and Megatron is swept away by the water. Starscream assumes that he is destroyed, goes to Mars and buries the Allspark there using nuclear missiles. Meanwhile, the Army investigates the Ark and finds the Energon generator, which they move to Area 51 in the Nevada desert. At the same time, Sam and Mikaela awaken and help the Autobots to recover. Léo has broken his leg and Boussard has been killed in the crash. Ratchet deploys the board computer Teletraan 1 to scan alt-moves fitting with the time period and all the Autobots change into them. Optimus tells Sam, Mikaela and Bumblebee to recover the Allspark from Hoover Dam while the Aerialbots destroy the Sun Harvester and retrieve the Matrix of Leadership from the Tomb of the Primes. Their plan is to erase the Transformers from Earth's timeline, finally giving them peace. Wheeljack and Perceptor stay behind to fix the ship with Léo while Optimus, Ratchet, Ironhide, Mirage and Hound investigate the world of 1982. At Hoover Dam, Sam and Mikaela discover about Starscream's attack and steal the wallet of a Sector Seven scientist named Herbert Davidson to buy clothes fitting with the time period. They then go to his house to see if he has any useful data about the Allspark, and where they discover that he is actually Sam's grandfather, Herbert Witwicky, using a cover name. Herbert reveals that Sam's ancestor, Captain Archibald Witwicky, discovered a mysterious key which led him to Megatron in Artic. The key enhanced Archibald's inteligence, but Sector Seven confiscated it, and withdrawl from it drove Archibald insane. Knowing this, Herbert stole the key from Sector Seven's vault and hid it on his apartment. Sam tells Optimus about this. Optimus reveals that the key leads to Vector Sigma, an ancient computer buried inside Cybertron, which created the Allspark. Sam takes it to Optimus. At the same time, 1982's Megatron is awakened and joins the Decepticons. Starscream finds out about this and is forced to feign loyalty to him, as they locate the Energon generator in Area 51. Meanwhile, the Autobots realize that the Ark is beyond repair, bury it underneath the mountain and decide to use the Nemesis to return to 2013. They break into the ship and Perceptor and Léo stay behind to fix it while the rest of the Autobots set to prevent the Decepticons from stealing the Energon generator. In Area 51, Soundwave deploys his minions Laserbeak, Ravage, Buzzsaw, Frenzy, Rumble and Ratbat to kill all humans inside it. They break into the facility and get close to the Energon generator, but Optimus and the Autobots arrive and a battle ensues. All of Soundwave's minions are killed. The Combacticons combine into Bruticus and fight the Aerialbots, who combine into Superion and defeats Bruticus. The Decepticons are overpowered and imprisioned at the Nemesis. Optimus retrieves the Energon generator and tries to use the key to Vector Sigma to locate the Allspark in Mars, but the radiation of Starscream's missiles shields its signal, and the Autobots and Decepticons are forced to return to 2013 without it. In 2013, the Nemesis emerges of a time rift only to be approached by a Autobot ship commanded by Ultra Magnus, leader of Autobot City, the Autobots' hideout on Earth. He reveals that, two years after the Nemesis' departure from the past, the Allspark's energy turned Mars into New Cybertron. The Autobots discovered about it and moved there, establishing a peaceful relationship with the humans, but the Decepticons also discovered about it and conquered the planet, forcing the Autobots to retreat to Earth, where they created Autobot City to fend off Decepticon incursions. During New Cybertron's siege, Optimus was murdered by Megatron, who was then destroyed, and Earth and New Cybertron have been on war ever since. Starscream claims he succesfully rewrote history, and Megatron says he'll pay for what he has done. Optimus orders Ultra Magnus to rally the Autobot army on Autobot City, and plans to take back New Cybertron. Meanwhile, in New Cybertron's Decepticon command center, the new leader of the Decepticon army, Shockwave, locates the key to Vector Sigma and mobilizes his troops to retrieve it. THE END.