The Scooby Doo Show premiered on ABC in September 1976 as part of The Scooby-Doo-Dynomutt Hour, in which new episodes of Scooby Doo shared an hour with a superhero dog named Dynomutt. It was a revamped version of Scooby Doo, Where Are You? which started on CBS in 1969.

Fred, Daphne, Velma, Shaggy, and the talking dog, Scooby-Doo, travel on the Mystery Machine van, in search of weird mysteries to solve.

After a chance train encounter with Laurence Knight, Tom Blake's family's fortunes prosper on the beneficence of the great financier. A developing friendship leads to the Knights selling their home to the Blakes when they move back to London. All looks rosy for the Blakes as share prices in Mr Knight's new business venture soar, but is their confidence misplaced?