Humans •
Mark Wahlberg as Cade Yeager: A single father and inventor who helped the
Autobots during the events of
Age of Extinction. •
Josh Duhamel as William Lennox: A former
NEST commander and
U.S. Army Ranger who partnered with the Autobots prior to the events of
Dark of the Moon, and now a
Colonel and reluctant member of the Transformers Reaction Force (TRF). •
Laura Haddock as Viviane Wembly: A
professor of English
Literature at the
University of Oxford and a
polo player, who turns out to be a descendant of Merlin. Minti Gorne portrays a younger Viviane. •
Isabela Merced as Izabella: A street-wise who was orphaned by the Battle of Chicago in
Dark of the Moon and now lives in the city ruins with Sqweeks and Canopy, her only friends, until meeting Cade. •
Jerrod Carmichael as Jimmy: A young man from South Dakota whom Cade hired through a want ad. •
Santiago Cabrera as Santos: A former
Delta Force operative and commander of the TRF, who seeks to eradicate every Transformer and their human allies regardless of faction. He also tries to capture or kill Cade Yeager as he knows he's working with the Autobots. •
John Turturro as Seymour Simmons: A former government agent of Sector 7 and NEST turned successful writer who hides out in Cuba, and was allied with the Autobots prior to the events of
Dark of the Moon. Garrigan previously portrayed a different iteration of King Arthur in the
fifth season of the TV series
Once Upon a Time. Additionally,
Mitch Pileggi,
Tony Hale, and
Gil Birmingham appear as a TRF group leader, an arrogant
JPL engineer, and Chief Sherman, respectively. Former
Navy SEAL Remi Adeleke also stars in the film as an unnamed TRF operator working for Santos, alongside other Navy SEAL veterans who play TRF operators in the movie's climax.
Nicola Peltz has a vocal cameo as Tessa Yeager, Cade's daughter, who helped the
Autobots during the events of
Age of Extinction and is seen in a photograph in Cade's trailer, while
Shia LaBeouf is seen as Sam Witwicky, who allied with the Autobots in events prior to
Age of Extinction, in a photograph spotted in Burton's mansion as a member of the Witwickens.
Stephen Hogan plays Viviane's father in
flashback scenes.
Voices is an alternate form used by Hot Rod. •
Peter Cullen as Optimus Prime: The leader of the
Autobots, who is searching for the truth about his Creators. In this film, he transforms into a blue and red 2014
Western Star 5700 Custom semi-trailer truck. •
Gemma Chan as Quintessa: A Cybertronian Sorceress, the "Prime of Life" and the creator of the Cybertronians who wants to destroy
Unicron (and Earth) and rebuild Cybertron in whatever way possible. Chan appears on-screen briefly as Quintessa in a disguised human form, at the end of the film. •
Erik Aadahl as Bumblebee / ZB-7: An Autobot scout and Optimus Prime's second-in-command, who transforms into a custom-built yellow and black 2017
Chevrolet Camaro with a body kit. •
Jim Carter as Cogman: A polite but
sociopathic, human-sized
Autobot. He serves as the faithful
butler to Sir Edmund Burton, and despite not having a larger robot mode, he transforms into a 2017
Aston Martin DB11 in the toyline. •
Omar Sy as Hot Rod: An Autobot who transforms into a 1975
Citroën DS, before upgrading into a 2017
Lamborghini Centenario LP770-4. He is brother-in-arms with Bumblebee and speaks in a thick
French accent which he's ashamed of and wishes to remove. •
Ken Watanabe as Drift: A
Samurai-motif Autobot tactician and former
Decepticon who transforms into a black and red 2017
Mercedes-AMG GT R. •
John Goodman as Hound: A trigger-happy Autobot
commando and
field medic who transforms into an olive green
Mercedes-Benz Unimog military tactical
ambulance. •
John DiMaggio as: • Crosshairs: A cocky
Autobot paratrooper and
sniper who transforms into a green and black 2017
Chevrolet Corvette C7 Stingray, equipped with a custom split-spoiler. His ego lends him a misplaced belief in his future command of the Autobots. • Nitro Zeus: A showboating Decepticon hunter who transforms into a
JAS 39 Gripen Fighter Jet. •
Reno Wilson as: • Sqweeks: A small Autobot and Izabella's closest friend who can transform into a blue
Vespa and only says "Chihuahua" due to prior damage. • Mohawk: A talkative and
psychotic Decepticon foot soldier who transforms into a
Confederate P51 Combat Fighter Motorcycle. His spark is in his head due to his body being skinny. •
Jess Harnell as Barricade: A Decepticon scout who was thought to have been killed in
Dark of the Moon. He now transforms into a
2016 Ford Mustang police car, featuring a new, sleeker robot mode. •
Tom Kenny as Wheelie: An Autobot and former Decepticon who survived the Chicago battle in
Dark of the Moon and transforms into a remote-controlled monster truck. •
Steve Buscemi as Daytrader: An Autobot scavenger who transforms into a cloaked rusty
Mercedes-Benz LK Model 1920 dump truck. •
Steven Barr as Topspin: An Autobot Wrecker who resides in Cuba with Simmons that once transformed into a #48
Hendrick Motorsports Lowe's/Kobalt car. In the film, he is credited as "Volleybot" and grows a metallic beard that resembles his fallen comrade,
Leadfoot. •
Mark Ryan as: • Bulldog: An Autobot veteran of
World War I and a sentry for Burton's
castle, who transforms into an army green
Mark IV tank and suffers from 'robot
dementia' • Lieutenant: An elderly Autobot that transforms into a
Hawker Hurricane fighter plane that cameos at Burton's castle. • Various uncredited actors voice: • The Knights of Iacon: a group of twelve Cybertronian Knights that protects the Staff and merge to form the three-headed
dragon, Dragonstorm. They include Dragonicus, Stormreign, Steelbane, and Skullitron. • Canopy: An Autobot
refugee and a friend of Izabella who transforms into a shielding pile of rubble. • Berserker: A monstrous
Decepticon commando who transforms into a 2017
Chevy Tahoe emergency vehicle.
Non-speaking characters • Grimlock The leader of the Dinobots, who transforms into a mechanical horned, fire-breathing
Tyrannosaurus. • Mini-Dinobots The Mini versions of
Grimlock, Slug, and Strafe named: Sharp T! (mini
Grimlock), 'Tops (mini Slug), Pterry (mini Strafe with only one head) • A Transformer who takes the form of the
submarine appears, though not seen in robot mode as it can't transform. • Trench An Autobot who resembles Constructicon Scrapper and transforms into a Cat 320 excavator. • Dreadbot A Decepticon thug who transforms into a rusty 1960
Volkswagen Type 2. • Infernocons Quintessa's demonic guardians who combine to form Infernocus. • Unicron A giant planet-destroying Transformer appearing as Planet
Earth and six of his mechanical horns are seen. ==Production==