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. Anime 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 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 kidnaps Shizuka, as well as steal the Small Light and prevent the children from returning to their normal size. Dorakoruru, the head of PCIA, leaves a message demanding Papi in exchange for Shizuka’s freedom. Papi leaves alone to surrender in while the children rewire Suneo’s model tanks for flight and combat. 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

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