

Deeming it dangerous, Sam gives the AllSpark splinter to his girlfriend Mikaela Banes (Megan Fox) for safe keeping, and leaves her and Bumblebee behind to go off to college taken by his father (Kevin Dunn) and mother (Alice White) after their home was destroyed by some small decepticons created by the splinter. Back in the United States, Sam Witwicky (Shia LeBeouf) finds a splinter of the destroyed AllSpark, and upon contact the splinter fills his mind with Cybertronian symbols. While on a mission in Shanghai, Optimus and his team destroy Decepticons Sideways and Demolishor, being given a warning by the latter that "The Fallen will rise again". In the present day, two years after the events of the previous film, Optimus Prime is seen leading NEST, a military organization consisting of human troops and his own team of Autobots (including newcomers Arcee, Chromia, Elita One, Sideswipe, Jolt, and the twins Skids and Mudflap) aimed at killing the remaining Decepticons on Earth. The remaining brothers thus sacrificed their bodies in order to hide the Matrix of Leadership the key that activates the Sun Harvester from The Fallen, who swore to seek revenge upon Earth. The Primes agreed that life-bearing worlds would be spared, but in 17,000 BC, one brother, thereafter dubbed "The Fallen", constructed a Sun Harvester on Earth. Known as the Dynasty of Primes, they used machines called Sun Harvesters to drain stars of their energy in order to convert it to energon and power Cybertron's AllSpark.

It is revealed that thousands of years ago there was a race of ancient Transformers who scoured the universe looking for energon sources.
