Sam Worthington as Jack

Ed Oxenbould as Dylan

Deborah Mailman as Maureen

Nicholas Bakopoulos-Cooke as Jason

Ena Imai as Kimi

Terry Norris as Grandpa

Peter Rowsthorn as Mr. Hickenlooper

Julian Dennison as Kevin

Yaron Zeilinger as Photo Kid

Kim Fleming as Photo Kid's Shy Dad

Chase Rafferty as Dylan (Age 4)

Chad Smith as Sydney Finalist

Jacob Brown as Sydney Finalist

Noah D'Annunzio as Sydney Finalist

Billie Jean Hamlet as Sydney Finalist

Zachary Brazier as Dylan (Baby)

Ryan Cruickshank as Small Boy

Alex Bryans as Sydney Competitor (uncredited)

David Wenham as Patrick (Jason's Father)

Josephine Hirst as International Competitor (uncredited)