Cool Cool Bye (1986)

Nobita finds a passage to a spaceship in another dimension. With their new friends, he and Doraemon fight the cruel leader of an exploited planet.

During summer vacation Nobita picks up a small rocket containing Papi, a palm-sized alien president escaping rebels on his home planet Pirika.

Nobita and Doraemon use time tree Mochi and catch a big bird, which has been extinct for 500 years ago. To protect the animal, Nobita and Doraemon go to Beremon Island, overseen by a golden beetle named Herakles.

The Noharas must survive a hoard of man-eating killer cacti after Shin-chan's father relocates the family to Mexico for work.

As Nobita, Gian, Shizuka, and Suneo are making their own space movie, a fleeing bug-sized alien president makes his way to Earth, and needs the help of the kids and Doraemon to stop an oppressive dictatorship threatening his democracy.

After a typhoon hits Nobita's town, he and Doraemon discover a wind sprite who, with some help from Doraemon's 22nd-century tech, takes them and their friends to a fantastic world of wind and storm people. But the wind sprite, named Fuuko by Nobita, had brought them to her world for a reason, as her peoples' gods are battling, and Suneo might be a key player in their feud.

Doraemon and his friends travel to the 22nd century to look for his golden bell, which was stolen by a notorious thief called Kaito DX.

For the past 150 years, humanity’s two greatest nations have been deadlocked in a meaningless war. In what is hoped to be a miraculous victory, the Alliance embarks on a battle to break through the Empire’s frontline. Like many other “decisive” battles, this can only end in disaster; a sentiment shared by Imperial nobleman Reinhard von Lohengramm and Alliance Commodore Yang Wen Li, both of whom realize how to turn the fight in their favor. And while the tides of war may never change, these two men must rise to the occasion, solidifying their place in history as heroes.

When the Ministry of Education goes back on its promise to keep Ooarai Girls Academy open, the task of saving the five-mile-long Academy Ship from the wreckers falls to Miho and her barely-seasoned tankery team. However, things go off track almost immediately. While the Oorai tank crew may have won the high school tournament, they’re now facing a larger and more experienced university team, and if they fail, their armored vehicles will be forfeit! Will they be swapping their tanks for the memories? It’s possible, but winning a tank battle is all about tactics and teamwork, and the fledgling Ooarai students have more friends and allies than anyone suspects.

A sapling Nobita discovers is turned into a plant-boy with help from Doraemon, and becomes Earth's only hope at passing judgment from the dryadic aliens of the Green Planet.