Synopsis: The film begins with a prologue of a battle on a faraway planet where the president is evacuated on a rocket. The film shifts to the Earth, where Nobita is kicked out by Gian and Suneo after destroying the set of the space movie they are making. Nobita runs to Doraemon and the two recruit Shizuka to make their own film.
During filming, Nobita finds what looks like a toy rocket. Later that night Nobita and Doraemon discover Papi, a tiny smart humanoid alien, in their room. Papi is able to talk with the Earth children through Translation Jelly (similar to Doraemon's own version) and explains that there is a dangerous enemy searching for him. Nobita and friends assure him that he will be safe in their home and they play together using Doraemon's Small Light to shrink themselves to Papi's size.
Meanwhile, Suneo's new set is destroyed by a whale-shaped spaceship and both he and Gian are attacked as well. Suneo assumes that the attack was Nobita's revenge. They go to confront him, but Papi explains that it was a battleship sent by PCIA to find him. He reveals that he is the president of his planet Pirika, which has been taken over by the dictator Gilmore. PCIA is the dictator's intelligence agency and they have been sent to capture Papi to ensure Gilmore's total victory.
Nobita and friends promise to protect Papi and they hide him in a secret base made by one of Doraemon's gadget. The PCIA battleship manages to infiltrate the base and kidnap Shizuka, as well as steal the Small Light and prevent the children from returning to their normal size. Dorakuru, the head of PCIA, leaves a message demanding Papi in exchange for Shizuka's freedom. Papi leaves alone to turn himself in while the children rewire Suneo's model tanks for flight and combat. While turning himself in, Papi's pet dog Rokoroko arrives but is too late to save him. The dog and Shizuka return to the others and together they plan to travel to Pirika using the same rocket that brought Papi to Earth.
At Pirika, Nobita and friends arrive at a secret base located in the planet's ring. Army chief Genbo explains that Papi is being held in PCIA's head office facing a death sentence. Most of the boys head to the planet with Rokoroko, while Shizuka and Suneo remain to defend the base from the PCIA space force. Nobita and friends rendezvous with a resistance group but are soon captured by PCIA soldiers after being traced down by Gilmore's cameras. After heading to the planet's surface in their tanks, Shizuka and Suneo are shot down as well. While their tanks sink into the ocean, Shizuka suddenly starts returning to her normal size.
At PCIA headquarters, Nobita and group are about to executed by firing squad, but suddenly Dorakoruru receives news that giant Earthlings have been spotted. Realizing that the Small Light's effect have expired, Nobita and friends return to their normal size as well and reunite with Shizuka and Suneo. Together with their Pirika allies, they battle the PCIA forces. Dorakoruru attacks them in his battleship, but Gian single-handedly takes it down and causes it to crash into the ocean. Meanwhile, Gilmore attempts to flee but is stopped by every citizen of Pirika rallied together, causing him to surrender.
With the planet safe, Nobita and his friends say goodbye to Papi and head back to Earth. On the way, they talk about going back to visit Pirika again the next week. The ending credit show snippets of their later visits.
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Uploaded by: Mohammad Mazbah Uddin (admin: Anime Tune BD)
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