Stephen Lang Talks ‘Sisu,’ ‘Avatar: Fire and Ash,’ and the Delicate Art of Playing “Gnarly Old Bastards”

The actor reflects on the tough-guy roles that led to his mad-villain turn in the “very, very Finnish” action extravaganza ‘Sisu: Road to Revenge’—and teases Miles Quaritch's “super kablooey crazy” arc in ‘Avatar 3.’