Rahna Rahna

Getting sillier than usual here. Considering Scooby has "met" other celebrities (NEW SCOOBY-DOO MOVIES) and DC superheroes and other Hanna-Barbera characters (SCOOBY-DOO TEAM-UP comic book series) It's too bad a Scooby/Muppet mystery special wouldn't be a possibility. At least maybe Miss Piggy would karate-chop Scrappy.

Scooby Do-Right

Hanna-Barbera/Jay Ward mashup.

Scrappy-Doo

Pretty obvious, isn't it?