S1E15 — The Sword, the Fox, and the Scooby-Doo!
Scooby-Doo and Guess Who? — Season 1, Episode 15.

While in Japan, the gang run into Mark Hamill, who's having a class reunion. A mystery presents itself when a fox monster kidnaps one of Hamill's old teachers.
View all episodes of Scooby-Doo and Guess Who?