Doraemon the Movie: Nobita and the Steel Troops

After giant robot parts fall from the sky, Nobita and Doraemon use the mirror world to construct Zandacross, a powerful robot they keep hidden. Their secret is threatened when Lilulu, a mysterious girl, arrives and requests Zandacross for an impending invasion. While Lilulu doesn't support the invasion of Earth, a robot army is on its way. Doraemon and his friends must join forces to confront the invading robots. The fate of Earth rests on their ability to stop the invasion, but it seems Lilulu is the only one who can ultimately prevent the conflict. The film explores themes of friendship, responsibility, and the dangers of powerful weapons.