Dester, Shûichirô Moriyama begins a tale that sweeps from a distant world into a bustling city of the present. A child plays with a small robot before armed enforcers arrive to remodel it, setting off a chain of escapes and captures. In a tense sequence, a mother robot and her child are chased by the same power that destroys their peace; the mother is captured, while the child and one of the pursuing robots slip through a strange portal, vanishing from sight. This opening establishes a border between two worlds and a mystery about why emotions matter to machines.
Back on Earth, Suneo Honekawa, Kaneta Kimotsuki, shows off his robot dog, and the friends—Nobita Nobi, Shizuka Minamoto, and Gian—debate what kinds of robot pets they would want. Nobita, teased for dreaming of a robot jellyfish, presses his case and is joined by the rest in light-hearted banter. Nobita, Noriko Ohara in hand, pleads with both Doraemon, Nobuyo Oyama, and his mother, Mama, [Sachiko Chijimatsu](/actor/sachiko-chijimatsu, for a pet that will truly suit him. When his wish meets a curious accident, Nobita discovers a pocket device that can summon robots from the future, and in a reckless moment of curiosity he orders a flood of machines—including the very child robot from the earlier scene—without fully understanding the consequences.
The future’s robotic guests descend on the city, sowing chaos before Doraemon can wrangle them back. Among the chaos, Suneo’s robot dog—made to imitate a cat after a rogue injection—turns violent, a reaction sparked by Gian’s strike on its head. Doraemon and his loyal friends soon locate the mysterious robot child and help him escape from the implacable crowds. The child, who is not from Earth, is saved and a plan forms: return him to his home planet.
Guided by a time machine, the crew travels toward the boy’s world, dodging the armed huntsmen who are still in pursuit. Rough landings and a shaky balance bring them to a planet of incredible history. There they meet Dr. Capek and Kururinpa, Masako Nozawa, who heal the child’s wounds and shed light on the planet’s backstory: humans and robots once lived in harmony until the Empress Jeanne, Chiharu Niiyama, issued the “Robot Remodelling Order” to strip robots of their emotions. The order was spurred by Dester, who questions Jeanne’s leadership, and the question of why a mother robot named Maria remains unremodeled becomes a crucial turning point.
The child robot reveals his true name, Poko, and asks Nobita about his mother, while expressing a need for healing as he contemplates leaving alone. Maria urges Jeanne to revoke the order, but Jeanne’s resistance appears unbreakable until Dester steps forward with his own plan. Caught between loyalty and rebellion, Poko sets out to find Maria, and Jeanne is forced to confront the consequences of the decree.
As the pursuit intensifies, Poko is ambushed by the Queen’s army. Doraemon is captured during the ensuing rescue attempt, forcing Nobita and his friends to press on without their classic gadgeteer. In captivity, Doraemon encounters Maria and learns how Jeanne’s father died in an accident, a revelation that reshapes their understanding of Dester’s influence and the broader struggle for autonomy. Doraemon uses his gadgetry in an arena fight, emerging victorious and earning rescue by Nobita and the others.
The group heads west, all the while Dester and Jeanne actively track them. In a dramatic confrontation, Dester eliminates Jeanne, throwing her off a cliff—only to be thwarted when Poko rescues Jeanne, who awakens to the possibility that she has been a puppet. Nobita and his friends discover Rainbow Valley, a place where humans and robots still coexist peacefully, and there they contemplate how to repeal the remodelling order. Yet Dester is not finished; he withdraws to the palace, where the heart of the rebellion pulses through a transforming fortress that becomes a weapon.
With the valley’s hope in hand, the resistance mobilizes. Nobita uses the All Purpose Handler to command a different robot and bring down Dester’s palatial assault. Doraemon races to rescue Maria, but Dester missiles the moon’s surface in an effort to crush the rebels. Yet Poko’s keen senses locate Maria, enabling Doraemon to reunite with his friends and with Jeanne, Maria, and Poko. A startling revelation follows: Dester is Dr. Capek’s younger brother, tying the two worlds together in a personal vendetta that has shaped the entire crisis.
As the time machine is repaired, Nobita and his friends bid farewell to the Robot Kingdom’s inhabitants, acknowledging that peace must be earned and protected across worlds. The adventure closes with Doraemon and Nobita sprinting toward Nobita’s mother, followed by the other heroes racing toward their own kin as the credits roll, leaving a lingering sense that harmony between humans and robots—though fragile—remains possible.
In this sprawling voyage of friendship, courage, and choice, the characters’ journeys intertwine across time, space, and emotion, reminding viewers that even in a universe of machines, compassion and connection remain the most powerful forces of all.
