Scooby-Doo! and the Samurai Sword
Its curator, Mr. Takagawa, was concerned that they were getting fewer visitors. He hoped that having the armour of the Black Samurai would save the museum. One night, the Ghost of the Black Samurai broke out of its casing and flew away. This was discovered to be just Sojo in disguise. However, the Black Samurai did come back to life through its armour and wreaked havoc, only to be stopped by Scooby-Doo and Shaggy Rogers.
Mr. Takagawa was able to this into a big hit, which got the museum relocated to a bigger building with the armour as its the main attraction of its grand opening. A statue in Scooby's honour was also erected near the main entrance.