Mark Wahlberg

Cade Yeager

Laura Haddock

Viviane Wembly

Peter Cullen

Optimus Prime (voice)

Anthony Hopkins

Sir Edmund Burton

Erik Aadahl

Bumblebee (voice)

Josh Duhamel

Colonel William Lennox

Gemma Chan

Quintessa

Jim Carter

Cogman (voice)

Santiago Cabrera

Santos

Isabela Merced

Izabella

Jerrod Carmichael

Jimmy

Stanley Tucci

Merlin

Liam Garrigan

Arthur

Martin McCreadie

Lancelot

Rob Witcomb

Percival

Marcus Fraser

Gawain

John Hollingworth

Tristan

Daniel Adegboyega

Saebert

Benjamin Maurice Webb

Hengist

Glenn Morshower

General Morshower

John Turturro

Agent Simmons

Tony Hale

JPL Engineer

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

Stephen Hogan

Viviane's Father

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

Nicholas Khan

Scientist

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

Mitch Pileggi

TRF Group Leader

Remi Adeleke

TRF Lieutenant

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

Frank Welker

Megatron (voice)

John Goodman

Hound (voice)

Ken Watanabe

Drift (voice)

Steve Buscemi

Daytrader (voice)

Omar Sy

Hot Rod (voice)

Reno Wilson

Mohawk / Sqweeks (voice)

John DiMaggio

Nitro Zeus / Crosshairs (voice)

Tom Kenny

Wheels (voice)

Jess Harnell

Barricade (voice)

Mark Ryan

WWI Tank / Lieutenant (voice)

Steven Barr

Nitro Zeus / Volleybot (voice)

Gil Birmingham

Chief Sherman (uncredited)

Eddie Hall

Saxon Warrior (uncredited)

Kevin Kent

TRF Group Leader (uncredited)

Jude Poyer

German Soldier (uncredited)