In 2013, Smit-McPhee filmed the action science fiction film Young Ones. The film premiered at the Sundance Film Festival in January 2014. Soon after, he appeared in Slow West, which was released in 2014. In March 2014, he was cast in the Nine Network's eight-part drama series Gallipoli; which was broadcast in February and March 2015, the year that marks the 100th anniversary of the Gallipoli landing. He plays 17-year-old Thomas "Tolly" Johnson, who ages himself up so that he can enlist with his brother Bevan and ends up fighting at Gallipoli in the campaign that helped create the Anzac legend. The series is produced by Endemol Australia and was shot over a three-month period starting in March 2014. On February 17, 2015, Bryan Singer announced that he cast Smit-McPhee as Nightcrawler in X-Men: Apocalpyse.