Adam Sandler

Michael Newman

Kate Beckinsale

Donna Newman

Christopher Walken

Morty

David Hasselhoff

Ammer

Henry Winkler

Ted

Julie Kavner

Trudy

Nick Swardson

Bed, Bath & Beyond Guy

Sean Astin

Bill

Joseph Castanon

Ben at 7 years old

Jenae Altschwager

Judy

Jonah Hill

Ben at 17 years old

Jake Hoffman

Ben at 22-30 years old

Tatum McCann

Samantha at 5 years old

Lorraine Nicholson

Samantha at 14 years old

Katie Cassidy

Samantha at 27 years old

Cheyenne Alexis Dean

Samantha's Friend

Cameron Monaghan

Kevin O'Doyle

Jennifer Coolidge

Janine

Jana Kramer

Julie

Rachel Dratch

Alice / Alan

Sid Ganis

Dr. Bergman

Sophie Monk

Stacy

Michelle Lombardo

Linda

Lily Mo Sheen

Lakeside Camp Girl

Willy Goldstein

Lakeside Camp Boy

Carolyn Hennesy

Kathy O'Doyle

Iryna Blokhina

Jogger

Katheryn Cain

Kirsten

Frank Coraci

Male Nurse

Tim Herlihy

Doctor

Brianna Davis

Firecracker Teen

Dolores O'Riordan

Singer

Sally Insul

Aunt Peggy

Theresa Barrera

Susie (uncredited)

Terry Crews

Singing Driver (uncredited)

Elizabeth DeCicco

Hot Assistant (uncredited)

Tracy Britton

Office Worker (uncredited)

Abra Chouinard

Hot Employee (uncredited)

Howard Fong

Ping Woo's Grandfather (uncredited)

Jorge Garcia

Ammer in SAP scene (uncredited)

Jason Sandler

Best Man (uncredited)

Celeste Thorson

Punk Chick (uncredited)

Lana Titov

Wedding Guest (uncredited)

Michael Yama

Watsuhita Head Executive

Mio Takada

Watsuhita Executive

Eiji Inoue

Watsuhita Executive

Toshi Toda

Watsuhita Executive

John Pagano

Bandleader

George K. Eguchi

Ancient Executive

Emilio Cast

Michael at 10 Years Old

Elena Patten

Samantha's Friend

Rob Schneider

Prince Habeeboo (uncredited)

Billy Slaughter

Newman Employee (uncredited)

Elliott Cho

Ping Woo

Alan Au

Ping Woo's Father

James Earl Jones

Narrator of Michael's Past (voice) (uncredited)

Ryan Keiser

Firecracker Teen

Christopher Levy

Firecracker Teen

Nickole Reyes

Firecracker Teen

Rob Jones

Firecracker Teen

Manish Goyal

Habeeboo Entourage

Marco Khan

Habeeboo Entourage

Ahmad Jordan

Habeeboo Entourage

Nick Hodaly

Habeeboo Entourage

Alireza Tanbakoochi

Habeeboo Entourage