Arthur
Mera
Vulko
King Orm
Atlanna
King Nereus
Manta
Tom Curry
Captain Murk
Jesse (Manta's Father)
Dr. Stephen Shin
King Atlan
Cargo Pilot
Young Arthur (Three Years Old)
Young Arthur (Nine Years Old)
Young Arthur (Thirteen Years Old)
Young Arthur (Sixteen Years Old)
Karathen (voice)
Brine King (voice)
King Ricou (voice)
Brine King & King Ricou
Fisherman Princess
Queen Rina
Newscaster (as Micah D. Ohlman)
Mike (Bully)
Matt (Bully)
Tour Guide (Aquarium)
Submarine Captain
Submarine Pirate
Submarine Crew Member
Cue Ball
Biker
Professor James
Newscaster Morgan
Metalsmith
Italian Vendor
Italian Young Girl
Italian Old Woman
Barfly
Italian Mother (as Nicoletta Bianca)
Flower Stall Vendor
Italian Bell Father
Italian Bell Girl
Italian Bell Mother
Ancient Atlantean Woman (as Pearl Alice Grantham)
Ancient Atlantean Child
Arthur's Teacher
Atlantean Soldier #1
Atlantean Soldier #2
Russian Submariner / Ancient Atlantean / Beachgoer (uncredited)
Village Mayor (uncredited)
Beachgoer (uncredited)
Arthur's Classmate (uncredited)
Italian Fish Monger (uncredited)
Waiter (uncredited)
Sicilian Villager (uncredited)
Submarine Crew (uncredited)
Russian Submariner (uncredited)
Atlantean Warrior (uncredited)
Atlantean (uncredited)
Beach Goer (uncredited)
Modern Atlantean (uncredited)
(uncredited)
Fisherman (uncredited)
Ancient Atlantean (uncredited)
Tourist (uncredited)
Bar Patron (uncredited)
Delivery Man (uncredited)
Russian (uncredited)
Commando (uncredited)
Russian Sailor (uncredited)
Arthur's Class at Aquarium (uncredited)
Russian Submariner #2 (uncredited)