Smit-McPhee, 11, will play Mortensen's son in the tale of a monthslong journey across a barren U.S. landscape after a cataclysmic event destroyed most of life on Earth. Charlize Theron co-stars in the Dimension Films drama.
2929 Prods., Nick Wechsler Prods. and Chockstone Pictures are producing.
The Melbourne native recently starred opposite Eric Bana, Marton Csokas and Franka Potente in Romulus, My Father. The Australian Film Institute nominated Smit-McPhee for best lead actor in Romulus and honored him with the Young Actor Award.
Smit-McPhee is repped by WMA, Active Artists Management in Australia and Goodmanagement.