Doraemon: Gadget Cat from the Future

The UnNoby (2x16)

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Sick of being picked on by Big G and Sneech, Noby gets Doraemon to show him an alternate world in which Noby is the neighborhood bully instead of Big G, but soon realizes that bully-Noby also has no friends. When bully-Noby escapes into the real world, it's up to Doraemon and the real Noby to stop him from causing real trouble.