Yuri Lowenthal

as Young Sammy (voice)

Gemma Arterton

as Shelly (voice)

Isabelle Fuhrman

as Hatchling Shelly (voice)

Melanie Griffith

as Snow (voice)

Tim Curry

as Fluffy (voice)

John Hurt

as Grandpa Sammy (voice)

Robert Sheehan

as Ray (voice)

Kathy Griffin

as Vera (voice)

Jenny McCarthy

as Shelly (voice)

Gigi Perreau

as Whale (voice)

Eric Unger

as Hatchling #1 (voice)

Kierstin Koppel

as Female Turtle #2

Pat Carroll

as Old Female Turtle (voice)

Charlie Adler

as Slim (voice)

Cam Clarke

as Seagull (voice)

Alan Shearman

as Old Turtle (voice)

Scott Menville

as Jacko (voice)

W.K. Stratton

as Fisherman (voice)

Pamela Adlon

as Female Turtle (voice)

Tim Dadabo

as Policeman (voice)

Al Rodrigo

as Ben/VW Driver (voice)

Charlie Schlatter

as Hippie (voice)

Donald Fullilove

as Green Turtle (voice)

William Brent

as Hatchling Sammy (voice)

Kayvan Novak

as Fluffy / Slim / Seagull / Robbie (voice)

Dominic Cooper

as Sammy (voice)

Joey Naber

as GreenPeace Worker (voice)