What's Happening was loosely based on the movie "Cooley High". It is sometime shown in reruns along with its vastly inferior sequel, What's Happening Now.
The heart of the show was the relationship among the three high school buddies, studious Roger, dim bulb Dwayne, and clownish Rerun. The late Shirley Hemphill got off some good zingers as the surly waitress of the malt shop the guys hung out in. Dee was the perfect snide and bratty kid sister to Roger, and Mama dished out discipline and love.
One of the best episodes was a two-parter that is seldom shown in reruns. Roger, Rerun and Dwayne were forced into illegally taping a Doobie Brothers concert (the rock group appeared as themselves) by some criminals. The tape recorder is discovered when it falls out from underneath Rerun's coat, and one of the musicians sees it. The Doobie Brothers then work with the three buddies to catch the criminals.