What's Happening!! Cast and Crew
| Cast |
 Ernest Thomas - (Roger Thomas) |
| Haywood Nelson - (Dwayne Clemens) |
| Fred Berry - (Freddie 'Rerun' Stubbs) |
| Mabel King - (Mabel Thomas; Roger's mother) |
 Danielle Spencer - (Dee Thomas; Roger's sister) |
| Thalmus Rasulala - (Bill Thomas; Mabel's ex-husband) |
| Lee Chamberlin - (Lee Thomas; Bill's second wife) |
| Shirley Hemphill - (Shirley Wilson; the waitress at Rob's Place, the soda shop hangout) |
| Earl Billings - (Rob; the owner of Rob's Place) |
| Bryan O'Dell - (Marvin; the high school newspaper reporter) |
| Chip Hurd - (Donna; Rerun's married sister) |
| Nathaniel Taylor - (Ike; Donna's husband) |
| Greg Morris - (Larry Clemens; Dwayne's father) |
| David Hollander - (Lil Earl) |
| Producer |
| Saul Turteltaub |
| Bernie Orenstein |
| Bud Yorkin |
| Dee Caruso |
| Gerald Bardner |
| Sidney Miller |
| Lloyd J Schwartz |
| William Bickley |
| Michael Warren |
| Writer |
| Sally Wade |
| Rick Mittleman |
| Alan Eisenstock |
| Larry Mintz |
| Joseph Neustein |
| Gene Farmer |
| David Pollock |
| Bruce Howard |
| Carol Gary |
| Jerry Ross |
| Thad Mumford |
| Jeremy Stevens |
| Tom Moore |
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