Go! Nobita Man is an episode from Doraemon (2005 anime)
Plot[]
Nobita and Doraemon uses "Emergency Rocket" to arrive at a planet with a particularly small gravity, and are taken in by a reporter. The reporter is hunted down for opposing the underworld. Nobita discovers that the people here are in poor physical condition due to the low gravity, so he helps the reporter eliminate the underworld and rescue his daughter. Nobita accidentally returns to Earth and is very disappointed.