The film begins with Optimus Prime explaining Cybertron's destruction at the hands of Megatron, and his quest to obtain the Allspark. Megatron discovers the Allspark on Earth, but crash-lands in the Article Circle, becoming frozen in the ice. Captain Archibald Witwicky and his crew of explorers stumble upon Megatron's body in 1897. Megatron's navigational system is activated by Captain Witwicky, and Archibald's eye glasses are imprinted with the Allspark's coordinates. Sector 7, a secret United States government organization, discovers the Allspark and builds the Hoover Dam around it to mask the energy signal. The still-frozen Megatron is moved into this facility, and is reversed engineered to further advance human technology.
In the present day, the rest of theDecepticons-Blackout, Frenzy, Barricade, Starscream, Scorponok, Bonecrusher and Devastator—have landed on Earth and assumed the disguise of Earth vehicles (except Scorponok, who keeps his scorpion-like alien form). Blackout and Scorponok attack a U.S. military base in Qator and try to hack into the military database to find where Megatron and the Allspark are, but fail when the network is manually shut down. While Blackout destroys the rest of the base, Scorponok chases a small group of survivors, but is eventually repelled. After their failure, Frenzy infiltrates Air Force One to hack again into the military database. He finds the map imprinted on Captain Witwicky's glasses, which his descendant Sam intends to sell on eBay for money. Frenzy and Barricade begin tracking Sam's location.
The Autonomous Robotic Organism (shortened to "Autobot") Bumblebee is also on Earth, disguised as a 1976 Chevy Camaro, and looking for Sam. Sam buys Bumblebee, who then helps him try to woo his crush, Mikaela Banes; Sam does not know that Bumblebee is an alien until he sees Bumblebee transform and send a homing signal to the rest of the Autobots. While Sam flees from his autonomous car, Barricade confronts him and demands Archibald's spectacles. Bumblebee, who is following Sam, transforms and defeats Barricade. Mikaela, who is also following Sam, is caught in the crossfire, and leaves with Sam and Bumblebee to rendezvous with the rest of the Autobots. The Autobots—Optimus Prime, Jazz, Ironhide and Ratchett—land on Earth and take on the forms of Earth vehicles. Sam, Mikaela, and the Autobots return to Sam's home to retrieve the glasses. Although the Autobots manage to get the glasses, agents from Sector 7 arrive and capture Sam, Mikaela and Bumblebee.
Frenzy secretly accompanies the group to the Hoover Dam and releases Megatron from suspended animation. Locating the Allspark, he sends an alert to the other Decepticons. Megatron escapes and Sam convinces the Sector 7 agents to release Bumblebee so that he can get the Allspark to Optimus Prime. The Decepticons chase the Autobots, who now possess the Allspark, into Mission City. An ensuing battle results in casualties for both sides: Optimus Prime kills Bonecrusher, Frenzy accidentally decapitates himself, Megatron kills Jazz, and both the Autobots and the military take down Devastator and Blackout. The battle ends with Sam killing Megatron when he rams the Allspark into Megatron's chest. Optimus expresses his gratitude to the humans and takes a fragment of the Allspark from Megatron's corpse. Bumblebee decides to remain with Sam. With the Allspark destroyed, Optimus knows that Cybertron cannot be restored, and sends a signal to any other surviving Autobots in the universe, directing them to Earth. The dead Decepticons are dumped into the Lauentian Abyss. The Secretary of Defense orders the termination of Sector 7. Starscream, the only confirmed surviving Decepticon, flies into space.
This movie was actually a movie that I was waiting for to come out at the theater and there ain't too many movies I wait for like that. Me, being a kid in the 80's and a big Transformer fan just had to see some of my re-newed childhood heroes again and the movie did not disappoint. I was sort of too anxious I think to see the actual Transformers when the movie started and it seemed like a long time for Optimus Prime and company to appear but it was just me. At the beginning of the movie (before the transformers appeared on the screen) it was kind of funny as Sam (Shia LaBeouf) is trying to impress a girl he likes Mikeala (Megan Fox). Bumblebee is the first transformer you meet in the movie, then all the Decepticons. Finally, all the Autobots make their appearances. The way they made this movie was great and I think anyone would enjoy it but I think if you grew up as a transformer kid in the 80's you will enjoy it even more.