Keke Palmer as Ramona (voice)

Michael Cera as Armen (voice)

Bobby Cannavale as Bobby (voice)

John Magaro as Manny (voice)

Jon Rudnitsky as Jimmy (voice)

Steven Van Zandt as Bruno (voice)

Vanessa Bell Calloway as Val (voice)

Shoshannah Stern as Shelly (voice)

Ron Funches as Anemone (voice)

Mario Cantone as Mr. Cacciatore (voice)

Russell Brand as Mako (voice)

Gideon Adlon as Denise (voice)

Liza Tarbuck as Camille (voice)

Lesli Margherita as Etta / Bedazzled Lady (voice)

Cassie Scerbo as Loretta / Sea Crab Mom / Female Land Crab (voice)

Phil LaMarr as Big Sal / Little Junior / Donny / Additional Voices (voice)

Steve Schirripa as Mr. Marinara (voice)

Sharon Angela as Mrs. Marinara (voice)

Jimmy Donaldson as Hot Sauce Crab (voice)

Joseph Balderrama as Chauncey (voice)

Sean Chiplock as Nigel (voice)

David Soren as Yoga Crab / Battle Dad (voice)

Valarie Rae Miller as Townie Crab / Neon Crab / Female Sea Crab (voice)

Jim Cummings as Curly / Local Land Crab (voice)

Maureen Van Zandt as Shop Mother (voice)

David Ian Salter as Unicorn Crab (voice)