BIG SCREEN

Cadillac Records (PG-13) -- Beyonce Knowles, Mos Def and Cedric the Entertainer are among the contemporary stars playing the legendary musical artists (including Muddy Waters, Chuck Berry and Etta James) who formed the stable of the 1950s label Chess Records. Directed by Darnell Martin (I Like It Like That).

Flow (Unrated) -- Director Irena Salina's award-winning documentary investigates the ongoing world water crisis.

Nobel Son (PG-13) -- A young man (Bryan Greenberg) used to living under the shadow of his famous father (Alan Rickman) is kidnapped and held for ransom after Dad wins the Nobel Peace Prize.

Punisher: War Zone (R) -- Ray Stevenson is the third actor (after Dolph Lundgren and Thomas Jane) to play Marvel Comics' vigilante hero, this time going up against the evil Jigsaw (The Wire's Dominic West). Call us crazy, but we're betting this results in lots of gunplay and explosions.

-- RENE RODRIGUEZ

Marijuana Nation (10 p.m. Tuesday, National Geographic) -- Reefer madness lives! It may have lost much of its media allure, but marijuana is bigger than ever. Perhaps two million Americans have toked up this year, according to this episode of the documentary series Explorer that examines cannabis chic from California (where, under the guise of medical treatment, marijuana has practically attained de facto legality) to Canada (where reporter Lisa Ling visits an industrialized grow house that produces a strain of the drug so potent that you can get wrecked on the amount baked into a single cookie).

Britney: For The Record (10 p.m. Sunday, MTV) -- This documentary, MTV boasts, at last allows Britney Spears to ''tell her side of the story in her own words.'' That is, she was too wearing underwear. And that baby's a really good driver, at least compared to Lindsay Lohan.

-- GLENN GARVIN

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