Mel Rodriguez as

Finn Wolfhard as

Casey Wilson as

Adam Devine as

Jessica Williams as

Robert Redford as Lokia the Dolphin Monster (voice)

Luther Campbell as

Amy Seimetz as

Doug Lussenhop as

Jon Glaser as

Saul Williams as

Eliezer Castro as Boat Dad

Luther Campbell Jr. as

Omar Caraballo as Police Officer

Wayne LeGette as Walter Price

River Butcher as

Rafael Castillo as Bad Rick Ross

Karel Curras as Yuri

Cameron Esposito as

Michelle feliciano as Sandra

Jason David Frank as

Heinley Gaspard as Rick Ross

Steve Gladstone as Richard

Mia Gonzalez as Sarah

Jaidi Marrero as The Creature

Daneel McDonald as Bad Rick Ross

Tallie Medel as

Phillip Mullings Jr. as Security Guard

Yaxeni Oriquen as

Adam Pally as Uncle Matt

Sharon Parra as Petra Alvarez

Ross Partridge as

Dylan Redford as

Danielle Schneider as

Or Schraiber as

Sophia Takal as

Daniel Gilchrist as Lokia