Mark Wahlberg

Cade Yeager

Josh Duhamel

Col. William Lennox

Stanley Tucci

Wizard Merlin

Anthony Hopkins

Sir Edmund Burton

Isabela Merced

Izabella

Laura Haddock

Vivian Wembly

Jerrod Carmichael

Jimmy

Santiago Cabrera

Santos

John Turturro

Seymour Simmons

Glenn Morshower

General Morshower

Liam Garrigan

King Arthur

Peter Cullen

Optimus Prime / Nemesis Prime (voice)

Frank Welker

Megatron (voice)

Gemma Chan

Quintessa

Erik Aadahl

Bumblebee (voice)

Jim Carter

Cogman (voice)

Omar Sy

Hot Rod (voice)

Ken Watanabe

Drift (voice)

John Goodman

Hound (voice)

John DiMaggio

Crosshairs / Nitro Zeus (voice)

Reno Wilson

Sqweeks / Mohawk (voice)

Jess Harnell

Barricade (voice)

Tom Kenny

Wheelie (voice)

Steve Buscemi

Daytrader (voice)

Steven Barr

Topspin (voice)

Mark Ryan

Lieutenant / Bulldog (voice)

Mitch Pileggi

TRF Group Leader

Tony Hale

JPL Engineer

Gil Birmingham

Chief Sherman

Remi Adeleke

TRF Lieutenant

Stephen Hogan

Viviane's Father

Martin McCreadie

Lancelot

Rob Witcomb

Percival

Marcus Fraser

Gawain

John Hollingworth

Tristan

Daniel Adegboyega

Saebert

Benjamin Maurice Webb

Hengist

Claude Knowlton

JPL Director

Jacob Zachar

Young JPL Engineer

Maggie Steed

Viviane's Grandmum

Sara Stewart

Viviane's Mum

Phoebe Nicholls

Aunt Helen

Rebecca Front

Aunt Marie

Minti Gorne

Young Viviane

Benjamin Flores Jr.

Kid

Aisha Kabia

Lawyer

Andy Bean

Lawyer

Mark Dexter

U.K. Prime Minister

Rob Jarvis

Downing Street Policeman

Tim Downie

Polo Player

Elizabeth Croft

High Society Woman

Christina Tam

Scientist

Pauline McLynn

Female Researcher

Mia Maria

Student

Seeta Indrani

News Reporter

Phill Langhorne

News Reporter

Simon Harrison

News Reporter

Wendy Albiston

Submarine Ticket Agent

John Burke

Pentagon Colonel

Barbara Eve Harris

Pentagon Colonel

Granville Ames

Pentagon Official

Jim Wisniewski

Government Suit

Vincent Jerome

TRF Operator

Alan Pietruszewski

F-35 Pilot

Drew Waters

F-16 Pilot

Walles Hamonde

American Serviceman

Tom Wright

Military Attache

Dan Warner

Military Attache

Charlie Bouguenon

Namibian Scientist

Jandre le Roux

Namibian Scientist

Eddie Hall

Saxon Warrior (uncredited)

Kevin Kent

TRF Group Leader (uncredited)

Jude Poyer

German Soldier (uncredited)