Jessie T. Usher as Quinn (voice)

J.K. Simmons as Claggart (voice)

Matthew Rhys as Grimes (voice)

Kristen Schaal as Beth (voice)

Patrick Warburton as Geraldo (voice)

Sharlto Copley as Switch (voice)

Camille Mana as Jing (voice)

John Kani as Brick (voice)

Dolph Lundgren as Dolph (voice)

Seal as Seal Seal (voice)

Bumper Robinson as HMMF Animal Handler / Chum (voice)

Julian Alexander Smith as Benji (voice)

Rick Zieff as Crunch (voice)

Richard Steven Horvitz as Snap (voice)

Vivienne Rutherford as Sam (voice)

Anjali Bhimani as Crabby Stabby / Seals / Sharks (voice)

Jan Johns as Mayday / Geraldo's Watch / Seals / Sharks / Octopi (voice)

Kate Micucci as Diving Dee (voice)

Daran Norris as Roger / Radio DJ (voice)

Matthew Mercer as Dave / Sharks (voice)

Jenny Yokobori as Geraldo's Watch / Seals / Octopi (voice)

Secunda Wood as Scarlet (voice)

Julia Anastasopoulos as Tour Guide (voice)

Greig Cameron as Harbor Seals / Seals / Sharks (voice)

Rob van Vuuren as Harbor Seals (voice)

Louw Venter as Harbor Seals (voice)

Tarryn Wyngaard as Harbor Seals (voice)

Jody J. Abrahams as Guards (voice)

Zolani Mahola as Guards (voice)

Bob Bergen as Seals / Octopi / Dolphin Sounds (voice)

Jason E. Kelley as Seals (voice)

Catherine Taber as Seals (voice)

Rodger Bumpass as Sharks (voice)

Bill Farmer as Seals (voice)

Neil Leachman as Seals / Sharks (voice)

Brendan Sean Murray as Seals / Sharks (voice)

Remy Edgerly as Seals (voice)

Joe Ochman as Seals (voice)

Genevieve Flati as Seals (voice)

Matthew Wood as Seals / Sharks (voice)

Kristina Mueller as Sharks (voice)

Brent Mukai as Sharks (voice)

Sarah Natochenny as Sharks (voice)

Quinton Flynn as Sharks (voice)

Ryan Robinson as Sharks (voice)

Lindsay Sheppard as Sharks (voice)