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• Hey, It's That Voice!: Jonny was voiced by Tim Matheson (credited as Tim Matthieson), who, besides extensive live-action work in TV and film, would also do voice-work on Sinbad, Jr., Space Ghost, Batman The Animated Series, and The Legend Of Calamity Jane. The first voice of Dr. Quest was John Stephenson, who did a lot of voice work for Hanna Barbera. The second voice of Dr. Quest was Don Messick, the voice of Ranger Smith, Boo Boo, Papa Smurf and Scooby-Doo (and Bandit).^note Most of his voice work was also for Hanna-Barbera, at least until Tiny Toon Adventures in 1990, where he voiced Hamton Pig.
  • In the 1980s series, Jeffrey Tambor did several voices such as Hard Rock and Dr. Bradshaw in "Deadly Junket", and Dr. Zin in the two TV movies.
  • Scott Menville voiced Jonny in the '80s series, while Rob Paulsen played Hadji.
• What Could Have Been: An article in Television Chronicles stated that Hanna-Barbera had planned at least 39 episodes for the '80s run of Jonny Quest. The dismal ratings and negative reaction played a part in the series' cancellation after episode 13.
  • Jessie Bradshaw was originally conceived as a character that would appear in a few episodes of the '80s series as a female counterpart to Jonny. When it came down to the actual episodes that were finished, she only appeared in "Deadly Junket". The misconception that she was a regular new addition comes from the writer stating his original plan, as well as fans confusing her with the later Jessie Bannon incarnation.