A Pup Named Scooby-Doo (1988)

S01E08 Now Museum, Now You Don't

Fred, Daphne, and Velma jump in to assist Shaggy and Scooby as they seek to prove their innocence after being falsely accused of stealing a collection of cursed Japanese swords. This curse summons the spirit of a Samurai Warlord, leading the gang to confront the ghost while unraveling the mystery behind the theft.