<Li> Liam Garrigan as King Arthur, the legendary knight who first fought with the Knights of Iacon . Liam Garrigan previously portrayed a version of King Arthur in Once Upon a Time . </Li> <P> Additionally, Mitch Pileggi, Tony Hale, and Gil Birmingham appear as a TRF group leader, a JPL engineer, and Chief Sherman, respectively . Nicola Peltz has a vocal cameo as Tessa Yeager, Cade's daughter, who helped the Autobots during the events of Age of Extinction, 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 . Tyrese Gibson was cast to return as Robert Epps, but was unable to appear in the film due to scheduling conflicts with The Fate of the Furious . </P> <Ul> <Li> Peter Cullen voices Optimus Prime / Nemesis Prime, the leader of the Autobots, who transforms into a blue and red 2014 Western Star 5700 Custom semi-trailer truck while searching for the truth about his Creators . </Li> <Li> Gemma Chan voices Quintessa, a Cybertronian Sorceress, the "Prime of Life," the "true" leader of the Decepticons and the creator of Cybertronians who wants to destroy Unicron (and Earth) and rebuild Cybertron through whatever way possible . She appears on - screen briefly in the mid-credits scene as the disguised human form of Quintessa . </Li> <Li> Frank Welker voices Megatron, the leader of the Decepticons, who possessed a KSI Drone in Age of Extinction and transforms into a Cybertronian jet . </Li> <Li> Erik Aadahl voices Bumblebee, an Autobot scout and Optimus Prime's second - in - command, who transforms into a custom - built yellow and black 2016 Chevrolet Camaro . </Li> <Li> Jim Carter voices Cogman, a polite sociopathic, human - sized robot . He serves as the faithful butler to Sir Edmund Burton, and while despite not having a larger robot mode, he transforms into an Aston Martin DB11 in the toyline . </Li> <Li> Omar Sy voices Hot Rod, an Autobot who transforms into a 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 . </Li> <Li> Ken Watanabe voices Drift, a Samurai - motif Autobot tactician and former Decepticon who transforms into a black and red 2017 Mercedes - AMG GT R . </Li> <Li> John Goodman voices Hound, a trigger - happy Autobot commando and field medic who transforms into an olive green Mercedes - Benz Unimog military tactical ambulance . </Li> <Li> John DiMaggio voices: <Ul> <Li> Crosshairs, a cocky Autobot paratrooper and sniper who transforms into a green and black 2016 Chevrolet Corvette C7 Stingray, equipped with a custom split - spoiler . His ego lends him a misplaced belief in his future command of the Autobots . </Li> <Li> Nitro Zeus, a showboating Decepticon hunter who transforms into an JAS 39 Gripen Fighter Jet . </Li> </Ul> </Li> <Li> Reno Wilson voices: <Ul> <Li> Sqweeks, a small Autobot and Izabella's closest friend who can't transform and only says "Chihuahua" due to prior damage . </Li> <Li> Mohawk, a Decepticon foot soldier who transforms into a Confederate P51 Combat Fighter Motorcycle . </Li> </Ul> </Li> <Li> Jess Harnell voices Barricade, a Decepticon scout who survived the Chicago War in Dark of the Moon . He transforms into a 2016 Ford Mustang police car, featuring a new robot mode . </Li> <Li> Tom Kenny voices Wheelie, a former Decepticon turned Autobot who survived the Chicago battle in Dark of the Moon . </Li> <Li> Steve Buscemi voices Daytrader, an Autobot scavenger who transforms into a cloaked rusty Mercedes - Benz LK Model 1920 dump truck . </Li> <Li> Steven Barr voices 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 grew a metallic beard that resembles his fallen comrade, Leadfoot . </Li> <Li> Mark Ryan voices: <Ul> <Li> "Bulldog", an Autobot veteran of World War I and World War II, and a sentry for Burton's castle, who transforms into an army Mark IV tank and suffers from' robot dementia', </Li> <Li> The Lieutenant, an elderly Autobot that transforms into a Hawker Hurricane fighter plane that cameos at Burton's castle . </Li> </Ul> </Li> <Li> Various uncredited actors voice: <Ul> <Li> The Knights of Iacon, a group of twelve Cybertronian Knights who protects the Staff and merge to form the three - headed dragon, Dragonstorm . They include Dragonicus, Stormreign, Steelbane, and Skullitron . </Li> <Li> Canopy, an Autobot refugee and a friend of Izabella who camouflages into a shielding pile of rubble . </Li> <Li> Berserker, a monstrous Decepticon commando who transforms into a Chevy Tahoe emergency vehicle, </Li> <Li> Onslaught, a Decepticon tactician who transforms into a green Western Star 4900SF tow truck, </Li> </Ul> </Li> </Ul> <Li> Peter Cullen voices Optimus Prime / Nemesis Prime, the leader of the Autobots, who transforms into a blue and red 2014 Western Star 5700 Custom semi-trailer truck while searching for the truth about his Creators . </Li>

Who does the voices in transformers the last knight
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