The follow-up to UPTOWN Saturday NIGHT, LET'S DO IT AGAIN re-teams Bill Cosby and Sidney Poitier as a couple of lodge members determined to save their club by hypnotizing a scrawny boxer into becoming a fight champ. TV-star Jimmie Walker plays the boxer and he has about as much personality as a TV-dinner. The laughs comes not via Walker, although his character's name is priceless, or the idiotic plot, but almost single-handedly from Cosby, who's given one of his rare chances to break loose in a movie. It's a shame he's spent the last twenty five years squandering his comic sensibility on vapid sitcoms. Poitier directed, the funky music score is by Curtis Mayfield and the excellent title song is performed by the Staple Singers.