What is the title of the 1988 Scooby-Doo series in which the gang appears as children?

The 1988 series in which the gang appears as children is A Pup Named Scooby-Doo. The animated show reimagines Scooby, Shaggy, Fred, Daphne, and Velma as younger versions of themselves solving mysteries.

The series uses a lighter and more exaggerated visual style than the 1969 original. Young Shaggy is still Scooby's closest human companion, while the children's personalities and catchphrases echo their older counterparts. The show also presents Red Herring as a recurring suspect.

The 13 Ghosts of Scooby-Doo and The New Scooby-Doo Mysteries are different series from the 1980s. Scooby-Doo and Scrappy-Doo likewise belongs to an earlier period and does not depict the entire gang as children.

A Pup Named Scooby-Doo ran for four seasons and gave the franchise a prominent prequel-style interpretation of its core characters.