One day Doraemon, Nobita, Shizuka, Gian and Suneo were shooting a film as space heroes. When they were shooting the film in the open lot a boy called Aron comes and alerts them of aliens attacking his planet. They agree
Doraemon: Nobita and the New Steel Troops: Winged Angels
Doraemon: Nobita's Dinosaur
Doraemon: Nobita and the Birth of Japan
Doraemon: Nobita's Chronicle of the Moon Exploration