Samuel Henry John Worthington (born August 2, 1976) is an Australian actor and writer. He portrays Jake Sully in the Avatar film series, Marcus Wright in Terminator Salvation, and Perseus in Clash of the Titans as well as its sequel Wrath of the Titans. He then transitioned to more dramatic roles, appearing in Everest (2015), Hacksaw Ridge (2016), The Shack (2017), Manhunt: Unabomber (2017), and Fractured (2019). He also voiced the protagonist, Captain Alex Mason, in the video games Call of Duty: Black Ops (2010) and Call of Duty: Black Ops II (2012).