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Transformers

The planet Cybertron was ravaged by a civil war between two Transformer factions — the Autobots, led by Optimus Prime, and the Decepticons, led by Megatron. Both search for a lost artifact called the AllSpark, a cube-like object that is the source of all Cybertronian life, to win the war. The Autobots want to find the AllSpark to rebuild Cybertron and end the war, while the Decepticons want to use it to conquer the universe. Megatron found the AllSpark on Earth, but crash-landed in the Arctic Circle and was frozen in the ice. Captain Archibald Witwicky and his crew of explorers stumbled upon Megatron in 1897. Captain Witwicky accidentally activates Megatron's navigational system, causing his eyeglasses to be imprinted with the coordinates of the AllSpark's location. Sector 7, a secret U.S. government organization, discovers the AllSpark in the Colorado River and builds the Hoover Dam around it to mask its energy emissions. The still-frozen Megatron is transported into the facility and is reverse engineered to advance human technology.

In the present day, the Decepticons — Blackout, Scorponok, Frenzy, Barricade, Starscream, Bonecrusher and Brawl — have landed on Earth and assumed the disguise of Earth vehicles and electronics. Blackout and Scorponok attack the U.S. SOCCENT military base in Qatar and try to hack into the U.S. military network to find the location of Megatron and the AllSpark, but their mission is thwarted when the base staff severs the network cable connections. While Blackout wrecks the rest of the base, Captain William Lennox, Sergeant Robert Epps, and their small group of survivors with photographic evidence of the robots escape the destruction. They are pursued by Scorponok, but he is repelled by air strikes. In the process, Lennox's team discovers that the only effective weapons against the Transformers' armor are high-heat sabot rounds. After Blackout's failure, Frenzy infiltrates Air Force One to hack into the military network and, in doing so, plants a virus. He finds the map imprinted on Archibald's glasses, which is owned by his descendant, Sam Witwicky, leading him and Barricade to begin tracking Sam's location in Los Angeles.

One of the Autobots, Bumblebee, is also on Earth, disguised as a 1976 Chevy Camaro, and is bought by Sam while shopping for his first car. Bumblebee helps him woo his crush, Mikaela Banes, and leaves at night to transmit a homing beacon to the Autobots, with Sam briefly seeing his robot form. The next day, Barricade confronts Sam and demands his grandfather's glasses, but Bumblebee rescues him and Mikaela. After Bumblebee upgrades his vehicle form by scanning a 2007 Chevrolet Camaro, they rendezvous with the arriving Autobots — Optimus, Jazz, Ironhide, and Ratchet — who also take on forms of Earth vehicles. Sam, Mikaela, and the Autobots return to Sam's home and obtain the glasses. Government agents from Sector 7, led by Seymour Simmons, arrive to arrest Sam and Mikaela, and capture Bumblebee after the Autobots try to rescue them.

Frenzy, disguised as a mobile phone, secretly accompanies the group to the Hoover Dam, where he alerts the other Decepticons upon locating the AllSpark and releases Megatron, while Sam convinces the Sector 7 agents to release Bumblebee so he can get the AllSpark to Optimus. The military’s communications are shut down by Frenzy's virus, but aided by a pair of hackers, Maggie Madsen and Glen Whitmann, they manage to alert the Air Force. The Autobot-human convoy goes to Mission City to obtain a radio to guide the Air Force and secure an extraction for the AllSpark as Decepticon forces attack the convoy. Bonecrusher, Jazz, Frenzy, Brawl, and Blackout are killed in the ensuing battle, and Sam manages to ram the AllSpark into Megatron's chest as he battles Optimus, killing him and destroying the AllSpark. Optimus takes a fragment of the AllSpark from Megatron's corpse, but realizes that Cybertron cannot be restored with its destruction. The U.S. government decommissions Sector 7 and sinks the deceased Decepticons into the Laurentian Abyss, while Sam and Mikaela begin a relationship, Starscream escapes into space, and Optimus sends a signal to other surviving Autobots, directing them to Earth.