Jessie T. Usher Quinn (voice) J.K. Simmons Claggart (voice) Matthew Rhys Grimes (voice) Kristen Schaal Beth (voice) Patrick Warburton Geraldo (voice) Sharlto Copley Switch (voice) Camille Mana Jing (voice) John Kani Brick (voice) Dolph Lundgren Dolph (voice) Seal Seal Seal (voice) Bumper Robinson HMMF Animal Handler / Chum (voice) Richard Steven Horvitz Snap (voice) Catherine Taber Seals (voice) Rodger Bumpass Sharks (voice) Bill Farmer Seals (voice) Anjali Bhimani Crabby Stabby / Seals / Sharks (voice) Bob Bergen Seals / Octopi / Dolphin Sounds (voice) Jenny Yokobori Geraldo's Watch / Seals / Octopi (voice) Kate Micucci Diving Dee (voice) Daran Norris Roger / Radio DJ (voice) Rick Zieff Crunch (voice) Matthew Mercer Dave / Sharks (voice) Rob van Vuuren Harbor Seals (voice) Louw Venter Harbor Seals (voice) Tarryn Wyngaard Harbor Seals (voice)