From The TV IV
The Scooby-Doo/Dynomutt Hour is a animated comedy that aired on ABC. It is made up of two 30 minute segments, with one starring Scooby-Doo, which is the third in a series of Scooby-Doo cartoons, and the other starring Dynomutt. The segments were later syndicated separately, with the Scooby-Doo episodes syndicated as The Scooby-Doo Show and the Dynomutt, Dog Wonder episodes as Dynomutt, Dog Wonder. The Scooby-Doo segments marked the first time that Scooby-Doo was on a network besides CBS, where it had been at for the first two incarnations.
Starting on December 4, 1976, the show was renamed to The Scooby-Doo/Dynomutt Show, and included a repeat of Scooby-Doo, Where Are You to make the show 90 minutes long. Scooby's lighter-furred and denser brother Scooby Dum appears in this series. His catch phrase is going "Dum dum dum dum" to the tune of the opening of Beethoven's fifth symphony whenever he either finds a clue or has an idea about something.
| Season || Premiere || Finale || #
| Season One || September 11, 1976 || December 18, 1976 || 16