"Two years have passed sine young Sam Witwicky (Shia LaBeouf) saved the universe from a decisive battle between warring races of robotic aliens. Despite his extreme heroics, Sam is still an average teenager with everyday anxieties about heading to college, leaving behind his girlfriend Mikaela (Megan Fox), and separating from his parents (Kevin Dunn and Julie White) for the first time. Of course there is the additional burden of trying to explain his departure to his newest friend and guardian robot, Bumblebee. For Sam the goal is to lead a normal university lifestyle, but to do that, he must ignore his destiny.
While Sam has done his best to put the conflict at Mission City behind him and return to his daily routine, the battle between the Autobots and Decepticons, although a top secret incident, has instigated many changes. Sector 7 has since been disbanded and its most loyal soldier, Agent Simmons (John Turturro), summarily dismissed. In its place, a new agency, NEST, has been created. Utilizing experienced field commanders like Lennox (Josh Duhamel) and Epps (Tyrese Gibson), NEST seeks to work side by side with the Autobots to avoid another deadly confrontation with the Decepticons. Unfortunately National Security Advisor Theodore Galloway (John Benjamin Hickey) possesses little foresight to fully comprehend the inexorable dangers which abound. Driven to gain control of every defense organization, along with their potential for power, and at the same time do away with what he sees as a frivolous government bureau, Galloway endeavors to terminate NEST, believing that any threat of war has long since passed. It is his conviction that humans share no vested interest in the Autobots’ dispute with the Decepticons.
Just as life is about to fall neatly into place at Sam’s new school, adapting to a new, albeit pushy, roommate, Leo (Ramon Rodriguez), and an equally pushy but much more attractive new acquaintance, Alice (Isabel Lucas), Sam suddenly becomes distracted by visions flashing across his brain like thunderbolts. Fearful that he is suffering from the dementia that plagued his grandfather, Sam keeps his visions a secret until he can no longer ignore the messages and symbols filtering through his mind.
Despite his best laid plans, Sam once again finds himself at the center of a tug of war between the Autobots and Decepticons with the fate of the universe at stake. Unbeknownst to Sam, he alone holds the key to the outcome of the struggle between evil and the ultimate power of good. With the help of his friends, his pals in NEST and even his parents, Sam finally learns to embrace the Witwicky birthright, no longer hiding from his family legacy: No sacrifice, no victory!"
Source is from here