Jack Black and Michael Cera play cavemen banished from their tribe, forcing them to rely on their own wits – and that's trouble right there – to survive in literally primitive territory.
Those who take their ancient history seriously should be braced to see it sliced and diced here; Hank Azaria, David Cross, Oliver Platt and Cera's "Superbad" pal Christopher Mintz-Plasse also are featured.
DVD extras: "making-of" documentary; deleted, extended and alternate scenes; outtakes. ** (PG-13 and unrated versions: AS, P, V) (Also on Blu-ray)
Buy 'Year One' on DVD.