Doraemon: Gadget Cat from the Future

Gorgon's Spell (2x25)

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Standing in the hall at school all day as punishment is hard on Noby's feet, so Doraemon gives him a gadget featuring a Gorgon head in a box to turn his feet to stone so he can stand painlessly. However, the Gorgon head escapes and starts turning people to stone - including Doraemon - and it's up to Noby to capture it by himself.