Blake Cooper as Bobby Marks

Donald Sutherland as Dr. Kahn

Luke Wilson as Marty Marks

Liana Liberato as Michelle Marks

Danielle Rose Russell as Joanie Williams

Luke Benward as Pete Marino

Sam Keeley as Jim Smith

Beau Knapp as Willie Rumson

Judy Greer as Lenore Marks

Ryan Boudreau as Dougie Newman

Shayna Bredbeck as Connie Marino

Brian Faherty as Sheriff Rumson

Joanna Herrington as Janice Williams

Lexie Roth as Beach Goer (uncredited)

Haley Pine as Beach Goer (uncredited)

Peter Harris as Beach Goer (uncredited)

Alex Madera as Beach Goer (uncredited)

Jessica Kent as Beach Goer (uncredited)

Connor Holden as Carnival Player (uncredited)

Rosario Corso as Hippie Beach Goer (uncredited)

Christopher Alan as Hi Striker (uncredited)

Joseph Bianchi-Coppola as Flirting Guy (uncredited)

Raquel Wallace as Beach Goer (uncredited)

Jessica Arsenian as Beach Goer (uncredited)

Seamus Knight as Taunting Kid (uncredited)

Ella Kuckes as Beach Goer (uncredited)

Brandon Garvey as Beach Goer (uncredited)