The peaceful tranquility of a small Western town is disturbed when a murderous car wreaks havoc by viciously mowing down innocent victims. New sheriff, Wade Parent, may be the only one who can stop this menace in its tracks until he realizes that the driver of this indestructible vehicle is far more dangerous than any man-- it is driven by pure evil.

Will anyone remember Scooby's birthday? A robbery at a TV studio turns out to be a ruse for a surprise party in Happy Birthday, Scooby-Doo, with host Mart Winkindale, a parade of pals, and one dire enemy from Scooby's past attending. In The Backstage Rage, Scooby must figure out who is pulling the strings when he discovers a poodle in distress is really a puppet. Finally, scary wax creatures melt Scooby-Doo's mind in Don't Fool with a Phantom.

In the final season, Kristen, David, and Ben continue to assess cases that involve wayward technology, possessed pigs, demonic oppression and infestation, a dance muse conjured by alleged witches, and an evil relic. Throughout, Leland attempts to lure Kristen into raising a baby antichrist who was conceived with her ovum. David is recruited by the Vatican's secret service to "remote view" a paranormal ability to see the unseen to detect evil.