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, for the AllSpark, a cube-like object that is the source of all Cybertronian life. 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. 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. Their mission is thwarted when the base staff severs the network cable connections. While Blackout destroys the rest of the base, Captain Lennox, Sergeant Epps, and their small group of survivors with photographic evidence of the robots escape the destruction, only to be pursued by Scorponok, but he is repelled by air strikes. 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 Captain Witwicky's glasses, which is owned by his descendant, Sam Witwicky. Frenzy and Barricade begin tracking Sam's location in Los Angeles.

One of the Autobots, Bumblebee, is also on Earth, disguised as a 1976 Chevrolet Camaro, and is bought by Sam while shopping for his first car. Bumblebee helps him woo his crush, Mikaela Banes. Bumblebee leaves at night to transmit a homing beacon to the Autobots, and Sam sees him in robot mode. Barricade confronts Sam and demands Archibald's spectacles, but Bumblebee rescues him and Mikaela. After Bumblebee upgrades his vehicle form by scanning a 2007 Chevrolet Camaro, they rendezvous with the Autobots: Optimus, Jazz, Ironhide, and Ratchet—who have landed on Earth and taken on forms of Earth vehicles as well. Sam, Mikaela, and the Autobots return to Sam's home and obtain the glasses. Soon, agents from Sector 7, led by Seymour Simmons, arrive to arrest Sam and Mikaela, and they capture Bumblebee after the Autobots try to rescue them.

Frenzy, disguised as a mobile phone, secretly accompanies the group to the Hoover Dam and releases Megatron. Locating the AllSpark, Frenzy alerts the other Decepticons. Sam convinces the Sector 7 agents to release Bumblebee so that he can get the AllSpark to Optimus Prime. Frenzy's virus has shut down worldwide communications, but a pair of hackers, Maggie Madsen and Glen Whitmann, manage to establish a signal to the Air Force. The Autobot-human convoy goes to Mission City to obtain a radio to guide the Air Force and secur…

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• Shia LaBeouf as Sam Witwicky: The young descendant of an Arctic explorer who stumbles upon a big secret that becomes the Earth's final hope.
• Tyrese Gibson as Sergeant Robert Epps: A U.S. Air Force Combat Controller and technical sergeant of a Special Operations team based at the U.S. SOCCENT base in Qatar and Lennox's best friend. Before Gibson was cast, Ashley Walters was approached for the role but had to turn it down as he had already signed a deal to do a small independent film in the UK.
• Josh Duhamel as Captain William Lennox: A good and dedicated hardworking leader of the Army Rangers team in Qatar and allies himself with Sam and others.
• Anthony Anderson as Glen Whitmann: Maggie's hacker friend.
• Megan Fox as Mikaela Banes: A classmate of Sam who assists him in his mission by using skills she learned as a juvenile car thief from her convict father.
• Rachael Taylor as Maggie Madsen: A former NSA data analyst recruited by the U.S. Defense Department.
• John Turturro as Agent Major Seymour Simmons: A special agent of the government agency Sector 7 Advanced Research Division.
• Jon Voight as John Keller: The U.S. Secretary of Defense.
• Michael O'Neill as Tom Banachek: Head of Sector 7.
• Kevin Dunn as Ron Witwicky: Sam's father.
• Julie White as Judy Witwicky: Sam's mother.
• Amaury Nolasco as Jorge "Fig" Figueroa: A Special Operations soldier who survives the destruction of the SOCCENT base in Qatar and was also a member of Captain Lennox's team.
• Zack Ward as First Sergeant Donnelly: A member of Captain Lennox's team.
• W. Morgan Sheppard as Captain Archibald Witwicky: Sam's great-great-grandfather who accidentally activates Megatron's navigational system while exploring the Arctic Circle.
• Bernie Mac as Bobby Bolivia: A used car salesman.
• John Robinson as Miles Lancaster: Sam's best friend.
• Travis Van Winkle as Trent DeMarco: Mikaela's ex-boyfriend.
• Omar Benson Miller as Glenn's cousin.

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Transformers had its worldwide premiere at N Seoul Tower on June 10, 2007. The film's June 27 premiere at the Los Angeles Film Festival used a live digital satellite feed to project the film on to a screen. A premiere took place at Rhode Island on June 28, which was a freely available event giving attendees the opportunity to buy tickets for $75 to benefit four charities: the Rhode Island Community Food Bank, the Autism Project of Rhode Island, Adoption Rhode Island, and Hasbro Children's Hospital. The film was released in IMAX on September 21, 2007, with extended footage that had not been included in the general theatrical release.
Hasbro's toy line for the film was created over two months in late 2005 and early 2006, in heavy collaboration with the filmmakers. Protoform Optimus Prime and Starscream were released in the United States on May 1, 2007, and the first wave of figures was released on June 2. The line featured characters not in the film, including Arcee. A second wave, titled "AllSpark Power", was set for release late 2007, which consisted of repaints and robotic versions of ordinary vehicles in the film. The toys feature "Automorph Technology", where moving parts of the toy allow other parts to shift automatically. Merchandise for the film earned Hasbro $480 million in 2007.

Deals were made with 200 companies to promote the film in 70 countries. Michael Bay directed tie-in commercials for General Motors, Panasonic, Burger King and PepsiCo, while props – including the Camaro used for Bumblebee and the AllSpark – were put up for charity sale on eBay. A viral marketing alternate reality game was employed through the Sector 7 website, which presented the film and all previous Transformers toys and media as part of a cover-up operation called "Hungry Dragon", perpetrated by a "real life" Sector 7 to hide the existence of genuine Transformers. The site featured several videos presenting "evidence" of Transformers on Earth, including a cameo from the original Bumblebee.
Transformers was released on DVD and HD DVD on October 16, 2007 in North America. The Wal-Mart edition of the DVD included a shortened animated version of the prequel comic book, titled Transformers: Beginnings and featuring the voices of Ryan, Cullen, and Dunn, as well as Welker as Megatron. The Target copy was packaged with a transforming Optimus Prime DVD case and a prequel comic book about the Decepticons. The DVD sold 8.3 million copies in its first week, making it the fastest-selling DVD of 2007, in North America, and it sold 190,000 copies on HD DVD, which was the biggest debut on the format. The DVDs sold 13.74 million copies, making the film the most popular DVD title of 2007.

The film was released on Blu-ray on September 2, 2008. In the first week, the two-disc edition of the Blu-ray was number one in sales compared to other films on the format. The Blu-ray version accounted for two-thirds of the film's DVD sales that first week, selling the third most in overall DVD sales. On June 16, 2009, Paramount included a sticker on all new Transformers DVDs that contained a code to view exclusive content online from the first film and get a sneak peek at Transformers: Revenge of the Fallen. The content includes three exclusive clips from Revenge of the Fallen, behind-the-scenes footage from both films, and never-before-seen deleted scenes from the first film. Transformers was released on 4K UHD Blu-Ray on December 5, 2017.

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