Skullduggery is the thirteenth and final episode of the 1980's Jonny Quest.
Dr. Zin steals an alien crystal skull to control the world, which may just be bring the end of it.
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- Professor McDoogle (single appearance)
- Crystal skull
- Communicon watch (mentioned)
|Scott Menville||Jonny Quest|
|Don Messick|| Dr. Benton Quest|
|Granville Van Dusen||Race Bannon|
|Vic Perrin||Dr. Zin|
- This is the last episode of a Jonny Quest series to have Jonny as a pre-teen.
- Dr. Zin came back in the 90's telefilms Jonny's Golden Quest and Jonny Quest Versus the Cyber Insects, where he had become withered and deceased, along with other questionable canon changes. This continuity was disregarded in the subsequent TV series The Real Adventures of Jonny Quest, returning him back to his old self, as well as revealing he had to adult daughters.
- Despite being called Professor McDoogle, Dr. Quest wrote down "Dr. McDoogle."
- Dr. Quest mentions Jonny's communicon watch, yet he's not wearing it.
- Jonny Quest: The Complete Eighties Adventures DVD set released on April 18, 2014 by Warner Archive Collection.
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|Creeping Unknown|| Jonny Quest (1986 TV series)|