Sam’s life changes when he buys his first car—a beat-up 1976 Chevrolet Camaro—which turns out to be the Autobot scout .
: The Decepticons infiltrate the facility and thaw their leader.
Once Bumblebee reveals his true identity, he summons the rest of the Autobots to Earth. Led by , the team explains that they must find the AllSpark before the Decepticons use it to turn human machinery into a new army and destroy Earth. The Battle for Earth
: The Autobots and human soldiers, led by Captain Lennox , transport the AllSpark to "Mission City" for a final stand against the Decepticons.
: During the climactic battle, Sam is forced to make a choice. Instead of merging the AllSpark with Optimus Prime's chest to save him, Sam thrusts the cube into Megatron’s spark, destroying both the artifact and the Decepticon leader.
In the aftermath, the remaining Autobots choose to stay on Earth, living among humans as "robots in disguise," while Optimus Prime sends a message into deep space for any surviving Autobots to join them.
The story converges at the , where a secret government agency called Sector 7 has been hiding the AllSpark and the frozen Megatron for decades.
: While Sam tries to impress his crush, Mikaela Banes ( Megan Fox ), the Decepticons launch brutal attacks on U.S. military bases to hack into government networks for clues about Megatron and the AllSpark. The Arrival of the Autobots