Braden Lewis

Beachgoer (uncredited)

Sonny Le

Metalsmith

Devika Parikh

Newscaster Morgan

Robert Longstreet

Professor James

Patrick Cox

Cue Ball

Kyryl Koltsov

Submarine Crew Member

Hank Amos

Submarine Pirate

Ilya Melnikoff

Submarine Captain

Sophia Emberson-Bain

Tour Guide (Aquarium)

Frankie Creagh-Leslie

Matt (Bully)

Jack Andrew

Mike (Bully)

Jon Fabian

Italian Vendor

Mabel Tamone

Italian Young Girl

Rita Dinardo

Italian Old Woman

Jordy Campbell

Arthur's Classmate (uncredited)

Joshua Levinson

Atlantean Soldier #2

Nicolas Bosc

Atlantean Soldier #1

Alice Lanesbury

Arthur's Teacher

Noa Tsuchiya

Ancient Atlantean Child

Pearl Grantham

Ancient Atlantean Woman