17 Again

Zac Efron

Mike O'Donnell

Leslie Mann

Scarlett O'Donnell

Thomas Lennon

Ned Gold

Michelle Trachtenberg

Maggie O'Donnell

Sterling Knight

Alex O'Donnell

Matthew Perry

Mike O'Donnell (Adult)

Tyler Steelman

Ned Gold (Teen)

Allison Miller

Scarlett (Teen)

Adam Gregory

Dom

Hunter Parrish

Stan

Mario Cassem

Samir

Kat Graham

Jamie

Tiya Sircar

Samantha

Melissa Ordway

Lauren

Melora Hardin

Principal Jane Masterson

Brian Doyle-Murray

Janitor

Josie Loren

Nicole

Jim Gaffigan

Coach Murphy