Humans
Shia LaBeouf plays Sam Witwicky.[4] The leading human character who is friends with the Autobots.
Rosie Huntington-Whiteley plays Carly,[45] Sam's new love interest from the original 1984 animated series. Huntington-Whiteley had worked with director Michael Bay before in various Victoria's Secret commercials.[46] Other actresses considered for the role included Gemma Arterton, Bar Refaeli, Miranda Kerr and Brooklyn Decker.[47]
Josh Duhamel plays Major William Lennox. The leader of NEST, an international taskforce battling Decepticons with the Autobots.
Tyrese Gibson plays Chief Robert Epps. A combat controller and a member of NEST.
John Turturro plays Agent Seymour Simmons. A former agent of the terminated Sector 7 unit.
Patrick Dempsey plays Dylan,[48] Carly's boss, who is a race-car driver with a huge collection of cars.[49][50] Dempsey described his role as "darker" than others and "significant to the plot".[51] Initially cast to play Mikaela's boss, Dempsey's role was reassigned when Mikaela was written out of the film.[52]
Kevin Dunn and Julie White play Ron and Judy Witwicky,[53] Sam's parents.
Glenn Morshower plays General Morshower, a NEST member who communicates with the squad in the Pentagon.[54]
Lester Speight plays Hardcore Eddie, a new NEST Member.[55] He is an experienced soldier who has fought in war along with Epps' father many years ago.[56]
Alan Tudyk plays Dutch, Agent Simmons' assistant.[57]
John Malkovich plays Bruce, Sam's first boss.
Frances McDormand plays Marissa Faireborn[citation needed], Director of National Intelligence.
According to representatives for Paramount, Megan Fox's absence from the film was due to Bay ultimately choosing not to renew her role,[58] although representatives for the actress said that it was her decision to leave the film franchise.[59] With Fox not reprising her role, Rosie Huntington-Whiteley was chosen to play Sam's new love interest. Ken Jeong will have an undisclosed role in the film,[33] and Kym Whitley has declared being involved in the shoots. A casting call for extras for the film has been said to call for actors to play Iranian military men for scenes to be filmed in Los Angeles,[60] and reportedly the Ukrainian army will be involved as well.[61] Glee's Iqbal Theba confirmed on Twitter that he will have a cameo appearance as the secretary-general of the United Nations.[62]
Autobots
Peter Cullen voices Optimus Prime, the Autobot leader. While he retains his vehicle mode of a blue Peterbilt 379 truck with red flame decals, he has been added a trailer similar to his Generation 1 counterpart,[63] and has been redesigned to look more heroic.[64] Optimus can combine with his trailer and gain a third transformation mode.[65][verification needed]
Leonard Nimoy voices Sentinel Prime,[66] Optimus Prime's predecessor who turns into a Rosenbauer Panther Airport crash tender fire truck.[67] Sentinel Prime is seen as the Autobot in stasis on the Ark in the teaser trailer.[68] Nimoy provided the voice for Galvatron in The Transformers: The Movie and had been considered for voicing The Fallen in Revenge of the Fallen.[6]
Bumblebee, Sam's guardian that turns into a fifth-generation Chevrolet Camaro. Bumblebee has also gone through some changes, his vehicle mode featuring a new body kit and paint job,[69] and designers modifying him to look more mature.[64]
Ironhide, the Autobot weapons specialist who transforms into a GMC Topkick.
Ratchet, the Autobot medic who transforms into a search and rescue Hummer H2. Ratchet also had some changes done to his vehicle form, as he has been painted green and white.[70]
Sideswipe, the Autobot whose vehicle mode is a silver Chevrolet Corvette Centennial, now upgraded into a convertible.[71]
Mirage[72], an Autobot who will debut as a red Ferrari 458 Italia.[33] Originally nicknamed "Dreadbox".[73]
James Avery will provide the voice of Silverbolt.[74]
The Wreckers, an Autobot sub-team that transform into heavily armed NASCAR Sprint Cup Series Chevrolet Impala stock cars equipped with machine guns.[75] They function as a Commando Unit. Bill ***erbakke will be the voice of one of them.[76] The Wreckers are:
Leadfoot, a Juan Pablo Montoya #42 Target car.
Roadbuster, a Dale Earnhardt, Jr. #88 AMP Energy/National Guard car.
Topspin, a Jimmie Johnson #48 Lowe's/Kobalt car.
Wheelie, a former Decepticon returns from his debut in Transformers: Revenge of the Fallen.[77]
A blue Mercedes-Benz W212 will debut as an Autobot inventor codenamed Q, whose design resembles Albert Einstein.[78][79] He has been said to be friends with Wheelie.[80]
Decepticons
Megatron, the Decepticon Leader. He has changed his vehicle mode to an armored rusty Mack Titan 10-wheeler tank truck equipped with heavy weaponry.[81] Due to the events from the last movie Megatron will hide half of his face by using a cowl.[82]
Shockwave, who transforms into a Cybertronian tank and will act as one of the film's main villains.[83][84] Corey Burton, who performed Shockwave's voice in all of Shockwave's major animated appearances was offered the role, but he declined it, so David Warner is being considered to voice him.[85]
Starscream, the air commander who transforms into an F-22 Raptor.[86]
Soundwave, Megatron's communication officer, now transforms into an SUV.[87]
Laserbeak, Soundwave's minion that resembles a mechanical condor.[87][88] Transforms into a Gyrodyne.[89]
A Decepticon has been revealed to turn into a Superfund armored security truck.[90]
A group of Decepticon clones known as The Dreads that turn into Chevrolet Suburban emergency vehicles.[91]
Others
Mark Ryan is also confirmed to be voicing several characters in the film.[92] Tom Kenny, who voiced Wheelie and Skids in Transformers: Revenge of the Fallen, confirmed that he is returning for Dark of the Moon, but his roles have not been revealed.[93]
