You are going to Watch Be Cool, Scooby-Doo! Episode 9 online free episodes with HQ / high quality. Stream cartoons Be Cool, Scooby-Doo! Episode 9 Online Screama Donna. To solve the mystery of a ghostly performer haunting her former venue, the Gang has to pretend to be a rock band themselves! But can they solve the case before Velma has to actually get on stage and sing?