By Annie Barrett
Updated January 29, 2009 at 06:57 PM EST

Michael Cera has been the only Arrested Development cast member to shy away from rumors that a film adaptation of Fox’s beloved-but-canceled TV series is a go. (It’s “more hypothetical than people think,” Cera said last week.) But according to Gatecrasher, Cera’s on-screen Pop-Pop, Jeffrey Tambor, insisted this morning on Cera’s involvement and even threatened some mild grandfatherly discipline: “If I have to call him up and say, ‘Get on set right now, young man,’ he’ll be there,” said Tambor. “The movie is going to happen this year, and Michael Cera is on board. Trust me.”