Marvin Andrew Sturmer is an American musician, singer, songwriter, and composer who co-founded the rock band Jellyfish in 1989. He was the group's lead vocalist, drummer, and primary songwriter.
A scientist creates a device that can enlarge anything and anyone to any size he wants. The suspicious thief takes the device and suddenly, he shines the beam on Daphne and she enlarges herself to the size of a Perfect Giantess (with her clothes intact). Scooby and the others have to solve the case about this thief and return Daphne to her normal size, while she has a little fun being a Perfect Giantess.
