Shaggy and Scooby-Doo are being chased by The Plotter and his accomplices. Shaggy wishes that he had never met Mystery Inc., just before crashing through a rotten floor. While unconscious, he dreams of what the world would be like with no Mystery Inc.: overrun with costumed monsters who were never caught.
Shaggy and Scooby-Doo saw him shaking his fist and his cane and them in Shaggy's dream. The "For Sale" signs in Shaggy's dream and the one outside the place where Shaggy and Scooby-Doo fell down into before Shaggy had his dream revealed him to by a real-estate broker.
It's a Wonderful Xmas from Scooby-Scooby-Doooooooooooo. Shaggy takes a tumble while fleeing from an imaginatively conceived masquerade by Pope and McRae. His trip to la-la land has him dreaming a little dream where Mystery Inc. never existed.
Simmons takes a time-honored tradition through the magnifying glass of the sleuth. Despite being consistently scared witless--evidenced by hilarious wild takes from the Shagster, Shaggy quickly learns that it's preferable to a world over-run by flamboyant real estate scammers. Bonus bell ringing for Simmons having Shaggy solve the mystery that led him to the insight.