Future gadgets being used throughout the town bring a surprise visitor from the future. The citizens try to figure out if it is Noby, Sneech, or Doraemon himself using the gadgets that brought this new person to their town. With a bomb that can destroy the Earth, Noby, Doraemon, Sue, and Sneech must find Big G before he unknowingly sets it off and keep it out of the hands of the futuristic visitor who happens to be a criminal that stole the bag of future gadgets in the first place.