Skullduggery is the thirteenth and final episode of the 1980's Jonny Quest.
Dr. Zin steals an alien crystal skull to control the world, but it may just end up ending 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.
- Depending on one's view of things, this is technically not the last appearance of Dr. Zin, but it is the last appearance of Zin before the major retcons of the 90's telefilms, Jonny's Golden Quest and Jonny Quest Versus the Cyber Insects, and the subsequent TV series, The Real Adventures of Jonny Quest.
- 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)|