You are going to Watch What’s New, Scooby-Doo? Episode 23 online free episodes with HQ / high quality. Stream cartoons What’s New, Scooby-Doo? Episode 23 Online Simple Plan and the Invisible Madman, En route to the Montreal Rock Festival, the gang runs into Simple Plan. As both their vans are wrecked they have to spend the night at a nearby ghost town. And worse yet it soon becomes obvious that something invisible is out to get Simple Plan. And even worse for Velma, Gibby Norton is also present in the ghost town.