Arthur

Jason Momoa

Mera

Amber Heard

Vulko

Willem Dafoe

King Orm

Patrick Wilson

Atlanna

Nicole Kidman

King Nereus

Dolph Lundgren

Manta

Yahya Abdul-Mateen II

Thomas Curry

Temuera Morrison

Captain Murk

Ludi Lin

Jesse Kane (Manta's Father)

Michael Beach

Dr. Stephen Shin

Randall Park

King Atlan

Graham McTavish

Cargo Pilot

Leigh Whannell

Young Arthur (Three Years Old)

Tainui Kirkwood

Young Arthur (Three Years Old)

Tamor Kirkwood

Young Arthur (3 Years Old)

Tainu Kirkwood

Young Arthur (Three Years Old)

Denzel Quirke

Young Arthur (Nine Years Old)

Kaan Guldur

Young Arthur (Thirteen Years Old)

Otis Dhanji

Young Arthur (Sixteen Years Old)

Kekoa Kekumano

Karathen

Julie Andrews

Brine King (voice)

John Rhys-Davies

King Ricou (voice)

Djimon Hounsou

Fisherman Princess

Sophia Forrest

Brine King/King Ricou

Andrew Crawford

Queen Rina

Natalia Safran

Newscaster

Micah Ohlman

Mike

Jack Andrews

Mike (Bully)

Jack Andrew

Tour Guide (Aquarium)

Sophia Emberson-Bain

Matt (Bully)

Frankie Creagh-Leslie

Cue Ball

Patrick Cox

Professor James

Robert Longstreet

Submarine Captain

Ilya Melnikoff

Submarine Pirate

Hank Amos

Biker

Luke Owen

Newscaster Morgan

Devika Parikh

Submarine Crew Member

Kyryl Koltsov

Metalsmith

Sonny Le

Italian Vendor

Jon Fabian

Italian Young Girl

Mabel Tamone

Barfly

Anthony Standish

Flower Stall Vendor

Victor Leto

Italian Old Woman

Rita Dinardo

Italian Bell Father

Vincent B. Gorce

Italian Bell Girl

Gabriella Petkova

Italian Mother

Nicolette Bianca

Arthur's Teacher

Alice Lanesbury

Atlantean Soldier #1

Nicolas Bosc

Ancient Atlantean Woman

Pearl Grantham

Italian Bell Mother

Oriana Iacono

Ancient Atlantean Child

Noa Tsuchiya

Russian Submariner /Ancient Atlantean /Beachgoer

Patrick Atchison

Village Mayor

Will Bergman

Atlantean Soldier #2

Joshua Levinson

Arthur's Classmate (uncredited)

Jordy Campbell

Beachgoer (uncredited)

Braden Lewis

Beachgoer

Harry Cummins

Submarine Crew

John Gettier

Russian Submariner

Daniel Goodwin

Atlantean Warrior

Bailey Hendy

Atlantean

Tahlia Jade Holt

Beach Goer

Lane Howson

Modern Atlantean

Wayne Huang

Ancient Atlantean

Ross Kernahan

Tourist

Niam Mayes

Bar Patron

Salvatore Merenda

Delivery Man

Marco Minici

Russian

Sam Monaghan

Atlantean

Anna Patch

Atlantean

Sam Price

Russian Sailor

Jon Quested

Atlantean

Jon Reigle

Russian Submariner

Thomas Sebecke

Ancient Atlantean

Jimmy Star

Beach Goer

Rafael Torrijos

Ancient Atlantean

Mikey Wulff

Russian Submariner #2

Connor Zegenhagen