Near the end of Fat Albert & the Cosby Kids' run on CBS, series creator & star Bill Cosby added a show-within-a-show, breathing life into the gang's comic book idol, The Brown Hornet. Cosby, of course, was the voice of the Hornet.
Each segment was prefaced with Albert and the gang gathering in the clubhouse to watch the show. Co-producer Lou Scheimer is the narrator, and you'll find a familiar name in the credits. Paul Dini was one of the writers, in one of his first jobs for Filmation. Dini would later work on He-Man before achieving icon status writing and producing Batman: The Animated Series in the 90's.
Following is a sample episode:
Bear in mind that the Hornet debuted in 1979, the same year that Ruby-Spears introduced Rickety Rocket, with its all-African-American cast, as part of the 2-hour Plastic Man show on ABC. Obviously, the Hornet had more staying power, as he stuck around until Fat Albert left CBS in 1984.