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Douglas Adams and writing partner John Lloyd wrote two episodes of Doctor Snuggles: The Remarkable Fidgety River and The Great Disappearing Mystery.

via Wikipedia:

Doctor Snuggles is an animated television series created by Jeffrey O’Kelly based on original artwork by Nick Price, about a friendly and optimistic inventor named Doctor Snuggles who has unusual adventures with his friends. The show featured fantastical scenarios which usually involved Doctor Snuggles inventing something outlandish such as a robot helper or diamond-making machine, and had a variety of supporting characters who were mostly anthropomorphic animals.

The show was a co-production between British and Dutch producers. The animation was primarily done by two studios, Topcraft in Japan and DePatie-Freleng in USA. English, Dutch, German and Spanish language versions exist, among others. In the English language version the title character was narrated by veteran actor Peter Ustinov. The show debuted in 1979, and consisted of thirteen half-hour episodes.