Professor Baffles (Casey Kasem in a dual role) is one of those misguided types who thinks he's doing something to benefit mankind by making all kinds of literature disappear. Ah, but there's a lesson to be learned, as Baffles is double-crossed by his henchmen. Here's "The Baffles Puzzle":
Wendy's volunteer job at the library suggests a call-back to Batgirl, aka Barbara Gordon, whose other job was as a librarian, per her earliest appearances in the 60's. Too bad Batgirl never got to appear in this series, as Hanna-Barbera never obtained the rights.