Sheriff Stone bursts in as the gang are investigating the Planispheric Disk and claims to have remembered a childhood experience wherein he was abducted by aliens. As the gang investigates Sheriff Stone's claims, real extraterrestrials consisting of a Grey Alien, a Nordic Alien, and a Reptoid, begin stealing valuable items from Crystal Cove. As Velma, Shaggy, and Scooby investigate, the Blake home is attacked and Barty's new car is stolen. The gang reunites to solve the mystery. Meanwhile, just after returning from Gatorsburg, the gang discover that their offices, located in the Town Hall, have been set ablaze, and the arsonists are revealed to be Brad Chiles and Judy Reeves.
Grey Alien/Traveler O'Flaherty, Nordic Alien/Sheela O'Flaherty, The Reptoid/Connor O'Flaherty