It has been a while since I've seen this episdoe (back when it was still running on the Cartoon Network) and yet I still remember it to this day partly because it was so interesting.
The story starts with a rumor of a werewolf, and Jonny and Jessie investigate while Hadji spends plenty of time with the girl he just rescued from a crazy werewolf hunter. But as the tale unfolds, we learn that he isn't hunting werewolves so much as a specific demon. As Jessie gets annoyed that Hadji is spending so much time with this mysterious woman, Jonny learns from the demon hunter some key information that's needed to save both Jessie and Hadji's life.
This episode was classic Jonny Quest, with the mystical element along with a riveting adventure where Jonny ends up saving the day again. Fantastic character developement with a wonderful plotline. One of my all-time favorite TRAJQ episodes by far!