Doraemon: Nobita's Great Adventure in the South Seas

Survivors from the planet Lagana, along with other space drifters, form the Galaxy Drift Fleet. To find a suitable planet for habitation, they dispatch the Cosmic Knights to search the universe. Leon and three others are sent to the Solar System, where they discover Earth. Unintentionally, they take Gian and Suneo, who were playing a "Galactic Grand Voyage" game, aboard their spaceship and leave Earth. Doraemon, Nobita, and Shizuka pursue them in a Space Rescue Ship to save them. However, during a spatial jump, their ship is struck by powerful electromagnetic waves and destroyed. Fortunately, Leon's ship also stalls at the same location due to a malfunctioning jump drive. Doraemon and the others board Leon's ship and happen to reunite with Gian and Suneo. When Leon and his group return to the Galaxy Drift Fleet, they find that an "Independent Army," led by Leon's father, Commander Ribelt, has emerged within the fleet. The Independent Army aims to invade habitable planets by force. Having learned about Earth through their spy Freya, they plan to attack it. Guided by Yoggdrasil, the god of the fleet, Leon meets his mother. She instructs him that to dismantle the Independent Army, he must first defeat Anglemoia, who controls his father. With the help of Doraemon, Nobita, and the others, they successfully resolve the crisis.