Based on the beloved cartoons from the 1980s and beyond. Director Michael Bay brings the Autobots and Decepticons to life. As they once again bring the battle to Earth for the Allspark, Energon, and their home of Cybertron
On their home planet of Cybertron, the Autobots and Decepticons are involved in an explosive battle over the coveted AllSpark. With the fate of the universe at stake, the Autobots send it far from the reaches of the ruthless Megatron, leader of the Decepticons. But there are even more surprises in store when it crash-lands on Earth.
When the Earth is caught up in the middle of an intergalactic war between two ancient races of robots, the heroic Autobots and the evil Decepticons, which are able to change into a variety of objects, including cars, trucks, and planes, it's up to an average American teenager to help unleash a power that will win the war and save Earth .
In 17,000 B.C., the Thirteen travel across the universe to create Spark with star-absorbing machines called Sun Harvesters, which destroy stars in order to collect their raw material. One of them defies the rule to never to destroy a planet with life by establishing a Sun Harvester on Earth, earning him the name "Fallen". The Fallen is confronted by the other Primes, who imprison him before he can harvest the Sun using the Matrix of Leadership. The rest of the Primes then sacrifice themselves to hide the Matrix in an unknown location.
In 1961, the ''Ark'', a Cybertronian spacecraft carrying an invention capable of ending the war between the benevolent Autobots and the malevolent Decepticons, crash lands on the Far side of the Moon. The crash is detected on Earth by NASA, and President John F. Kennedy authorizes a mission to put a man on the Moon as a cover for investigating the spacecraft. In 1969, the crew of Apollo 11 lands on the Moon.
When humanity allies with a bounty hunter in pursuit of Optimus Prime, the Autobots turn to a mechanic and his family for help.
In 484 AD, King Arthur and his Knights of the Round Table fight a losing battle against the Saxons. Elsewhere, Merlin approaches the Knights of Iacon, a group of Transformers hiding on Earth, to help win the war. They hand him an Extraterrestrial life wand, before transforming together into Dragonstorm and turn the tide of the battle, but warn Merlin that a great evil will come for the staff.
On Cybertron the Autobot resistance, led by Optimus Prime, is on the verge of losing the civil war against the Decepticons and prepare to evacuate the planet. A Decepticon force, led by Soundwave and Shockwave, intercepts them during the evacuation, and Optimus sends Autobot scout Bumblebee to Earth on an escape pod in order to set up a base of operations where the Autobots can regroup.