The Mega Mondo Pop Cartoon-a-Con in sunny California marks the spot for mystery in this all-new original Scooby-Doo adventure! Herculoids Frankenstein Jr. and Space Ghost are just a few of the celebrated comic book characters headlining at the unconventional convention plus there's a megabucks movie premiere starring Scooby-Doo and Shaggy's all-time favorite super heroes Blue Falcon and Dynomutt!