'Year One' features the hyper-stylized flow of Jack Black and the more laidback comic science of Michael Cera as a pair of pre-historic dudes bumrushing their way through the less-than-epic first era of Man. Problems abound in this tone-deaf mix, beginning with the fact that Zed (Black) and Oh (Cera), besides being completely incompetent as hunters and gatherers — the only jobs available at the time in their village — aren't even thinly disguised versions of the actors. Grade: D-.