Samuel Henry John "Sam" Worthington (born 2 August 1976) is an English-born Australian actor, best known for his portrayals of main character Jake Sully in the highest-grossing film of all time, Avatar; Marcus Wright in Terminator Salvation; Perseus in Clash of the Titans and its sequel, Wrath of the Titans; and Alex Mason in the video game Call of Duty: Black Ops and its sequel Call of Duty: Black Ops II.