A couple encounter mysterious atmospheric effects in an airplane and find themselves in a town where people behave oddly.

Clay Spencer and his wife, Olivia, live in a small town deep in the mountains. When Clay isn't busy drinking with his buddies or railing against the town minister, he's building the house he's always promised Olivia. He is overjoyed when he learns his eldest son will be the first Spencer to attend college, if he can resist the charms of a pretty local girl and rustle up the money for tuition.

Santa has an accident at Fred's house on Christmas Eve, Fred and Barney have to continue his run for him.

The Scooby-Doo/Dynomutt Hour is a 60-minute package show produced by Hanna-Barbera Productions in 1976 for ABC Saturday mornings. It marked the first new installments of the cowardly canine since 1973, and contained the following segments: The Scooby-Doo Show and Dynomutt, Dog Wonder.