In 2011, he voiced Crazy Smurf in the live-action/animated film The Smurfs, and in 2012, he voiced Jealousy as well as Gumball, Penny, Leslie, Carrie & Darwin when he possesses them in The Amazing World of Gumball episode "The Flower". Kassir appeared in Bryan Singer's Jack the Giant Slayer (2013), along with Bill Nighy, as Fallon, the two-headed leader of the giants; Nighy played the big head while Kassir played the small head.