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Scooby-Doo and Scrappy-Doo (first series)
What's New, Scooby-Doo?
Scooby-Doo (DC Comics)
They tried to protect a piece of the Dragon's Eye from a master thief there. The Dragon's Eye, Part 6: Scooby-Doo Dai Kaiju Tengu
Scooby-Doo! And The Samurai Sword
The gang traveled there for a martial arts tournament and soon were caught up in the case of a Black Samurai.