Doraemon: Gadget Cat from the Future

Feeling Crabby (2x13)

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Noby promises his friends a king crab feast, but real crab is too expensive, so Doraemon demonstrates a gadget that can change an object's outward appearance (i.e. giving another food the appearance of crab). Doraemon and Noby are accidentally changed into crabs themselves - and Noby nearly ends up as dinner for Big G's family.