Two years after saving the world with the Autobots, Sam Witwicky (Shia LaBeouf) is away at college when an ancient Decepticon named "The Fallen" returns to Earth on a mission of vengeance. With the Allspark destroyed, the Autobots lose all hope of returning to their home planet of Cybertron, and begin working with an elite military known as NEST to hunt down any remaining Decepticons. But even as they fight for humanity alongside Major Lennox (Josh Duhamel) and USAF Master Sergeant Epps (Tyrese Gibson), the Autobots are acutely aware that not all humans are thrilled by their presence on planet Earth. When National Security Advisor Theodore Galloway (John Benjamin Hickey) wages a heated campaign aimed at exiling the giant robots back into space, head Autobot Optimus Prime agrees to comply with the voice of the people, while warning them of the potential consequences of leaving the planet unprotected.