From his spaceship lair, Dr. Phineus Phibes attempts to create an electrical storm that will forever envelop Earth.  He also decides that the epicenter of the storm is going to be Scooby and Shaggy’s mansion. Overcoming his intense (and very dog-appropriate) fear of lightning, Scoob travels with Shag to take on Phibes. With the help of a Super Speed Scooby Snack (and Phibes' own men, who believe Scooby and Shaggy are wise, avenging aliens) our heroes save the day — and Earth with it!