Thin, jug-eared, and rubber-faced black comedian Jimmie Walker is best remembered for playing J.J. on the sitcom Good Times (1974-1979). His exuberant Dyno-mite!! was briefly a popular catch phrase back then. Walker made his feature film debut in Sing Thanksgiving (1974). Following the demise of his show, Walker embarked upon a modest film career and carried on with his standup career.
He occasionally showed up on television talk shows and in 70's retrospectives, not afraid to poke fun at his '70s persona. ~ Sandra Brennan, All Movie Guide. 