The Hardy Boys.

The Hardy Boys is an animated series, produced by Filmation and aired Saturday mornings on ABC in 1969. It featured the Hardy Boys, Joe and Frank, along with their friends Chubby Morton, Wanda Kay Breckenridge, and Pete Jones touring as a rock band while solving mysteries. The series is also notable for its opening and closing credits, which the Hardys appeared in live action. The series debuted at the same time as Hanna-Barbera's similarly themed Scooby-Doo, Where Are You!, which was scheduled against the show on CBS.