Scooby and the gang attend a rock concert of their friend, Alex Super. The show turns sour when Alex and his band sing a number based on an ancient voodoo chant. This conjures up a witch doctor named Mamba Wamba, who kidnaps Lila, a member of the band. The gang hunts down Mamba Wamba at Maison Dupree, an old Southern plantation. There they meet two zombies, one of whom is Lila. It’s up to the gang to solve this mystery before they become zombies themselves. . . . The Blue Falcon and his inept mechanical sidekick, Dynomutt the Dog Wonder, find their super-abilities tested by the evil Queen Hornet. With a gun that squirts quick-drying honey and a hive full of angry hornets to do her bidding, the Queen Hornet seems impossible to stop.