It’s back to the Stone Age for Warner Bros. Will Ferrell and Adam McKay are set to produce a new animated Flintstones film for WB, with their Gary Sanchez Productions partner Chris Henchy scripting. Two decades have passed since Universal gave the 1960s Hanna-Barbera animated sitcom its first live-action outing starring John Goodman and Rick Moranis, then followed with a 2000 prequel that notoriously bombed at the box office.