The costume made him appear much larger, and it was operated by levers from inside.
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A Pup Named Scooby-Doo
Mr. Dayton based it on the story of evil samurai warlord, Lord Asakari. He dressed up as the Samuri Ghost so he could steal the swords to make a million bucks. The costume made him appear much larger, and it was operated by levers from inside. (Now Museum, Now You Don't)
(after being unmasked) "I could've make a million bucks, if it weren't for these pesky kids and their pup."
-- Mr. Dayton