Dogs and cat are together again. Three dogs and one cat are now good friends and they continue their adventures while they are following their owner, a forest ranger (played by Petr Shelokhonov). This time the cat becomes the leader of the four friends. Cat Svetofor together with three dogs: Bubrik, Fram, and Toshka are going on a winter journey, they follow their owner on an airplane flying North. The four animals travel to a nursery where Christmas trees are grown. There four animals help people to stop the fire and save Christmas trees. Then, together with their owner, the four friends join children for celebration of the New Year.
One day,Nobita was stuck in the school again,his teacher not letting him to go(He hadn't completed his homework).While his teacher had allowed him to go,Nobita rushed to his house,fearing that his mother would scold him.On his way,he found a dog,dirty and hungry after fighting with a dog previous night.Nobita wanted to help it,but he couldn't.When his mom sent him to bring some things from the market,he had gone there,and while he returned,he spotted the dog again,and Nobita gave him a sausage that he had brought from the market.
Suneo shows everyone but Nobita a fossil of dinosaur claw. Angry, Nobita claims he will be able to find a living dinosaur. As Doraemon refuses to help him, he digs on a hillside, but instead earns punishment from a landlord nearby who forces him to unearth a hole in the ground. He finds an egg-shaped stone underneath and quickly uses a time wrap to return it to its former form and after warming it, the egg hatches to reveal a Futabasaurus, who is subsequently named Piisuke by Nobita. Instead of immediately showing it to the others, Nobita waits it grow while making a deal with others. As Piisuke grows too large and is in danger of being found, Doraemon and Nobita transport him to 100 million years ago in the Late Cretaceous period. They are attacked by a mysterious assailant who previously tried to make a deal with Nobita to sell Piisuke, though they manage to escape. Left with no proof, Nobita instead shows them Piisuke through a television monitor, but realizes that he and Doraemon had unknowingly transported Piisuke to the North American shore after the time machine was attacked by the assailant. They and the others decide to go there, but the time machine is overloaded and crashes off.
The plot revolves around a summer vacation of Nobita and his friends under the waters of the Pacific Ocean. Gian and Suneo take Doraemon's underwater vehicle and travel through the Atlantic Ocean, trying to find a treasure ship. Along the way, they discover that the environment gun that Doraemon used to protect them is running out of energy leaving them vulnerable to the sea. Fortunately, they are rescued by some marine creatures. Doraemon and his friends are later captured by these creatures, revealed to be inhabinats of the underwater kingdom of Mu. It is revealed that another undersea kingdom, Atlantis, now controlled by robots, was about to destroy the Earth with nuclear weapons after mistaking a volcano eruption for an invasion. With the help of a young boy from Mu, Nobita and his friends attempt to stop the robots, but are all captured. However, when things are at their grimmest, Doraemon's robotic underwater vehicle sacrifices itself to destroy the computer that controlled all the robots and nuclear weapons. After returning to Mu, Doraemon and his friends are hailed as heroes before returning home.
Nobita and his friends are discussing school project themed around seas and oceans. Interested in pirate life and treasury, Nobita asks Doraemon to help him find secret treasures. Doraemon at first denies the pirates roaming in the present day as well as the existence of secret treasures, but after learning news about recently discovered treasury, he helps Nobita in his sea voyage in search for the secret treasure. Bringing along Shizuka, Gian, and Suneo, they roam the South Sea while playing ship and sea danger simulators with Doraemon's gadgets.
This episode is set in the future 2011 where the main characters from Doraemon are all grown up and have kids. Minidora (mini doraemon) accidentally gets delivered to the Nobita's future house. The sons of Jyaiyan, Suneo and Nobita plays with Minidora with the special goods he brings out of his pocket. But trouble happens when they ran away from Dorami, who came to retrieve Minidora.
Seven years ago, Lopplc and Morina were playing at a park. Suddenly they felt an earthquake on the Koya Koya Planet. The quake was so massive that the planet was destroyed. Everyone had to escape using a giant ship. A sudden bolt of lightning damaged the ship, causing a power failure. The Professor (who was Morina's father) wanted to fix the spaceship, but another lightning strike took him to another dimension him. Meanwhile, Nobita's friends get him to retrieve a ball from a group of tough baseball players. But they chase him and drop him down a manhole. Gian gets angry upon him and he runs toward Shizuka's house to save himself. But finally caught by him and beaten off well. Two alternate universe creatures, Lopplc and Chammy, are escaping from an enemy ship. While Nobita is sleeping, he suddenly feels the floor is trembling, like an earthquake. A little rabbit from the alternate universe named Chammy opens the door between the dimensions using a hammer. Nobita wakes up and Doraemon hears somebody steal food from the fridge. Chammy is caught by Doraemon and Nobita. She shows them the passageway through Nobita's floor into the spaceship. After they enter the spaceship, they see Koya Koya Planet, and meet Lopplc (12 years old). Soon the become good friends. Lopplc takes Nobita to his friend Morina who continuously ignores them. On the next visit Nobita brings his friends with him and they play in a meadow. They got attacked by mining agents who wanted to get crystals from the planet's crust. All of them run away to their own dimension. Next day Nobita is scolded by her mother for hiding his test paper. Nobita and Doraemon again decide to meet Lopplc but suddenly Dorami comes and takes Doraemon for his check up. Nobita decides to go alone to Koya Koya Planet. Abruptly he got sucked by another dimension and he reaches to another planet. He got chased by a dinosaur, only to be saved by Doraemon' gadget. On the next visit, the mining agents warn them to move from there but they fight with them easily as there was difference in the gravities of both planets. They quickly defeated them and destroyed their ship. Lopplc tells all of the town's people about Doraemon and Nobita but miners took the ship, so they had no evidence to prove that. Every time the miners try to tease people, Doraemon and Nobita save them. So people agreed that Nobita and Doraemon are really strong. Soon the leader of the group of miner came to know about Doraemon and Nobita. He devised a trap to catch them but Doraemon and Nobita luckily destroyed their plans. So the leader decided to take care of them himself. Leader went Morina, to tell him the secret passage through Nobita and Doraemon come. Morina tell them as he told her that her father died as a result of mayor's decision. Leader fixes the bomb to the Dimensional door so that any one who opened it will be blasted. Leader warned the people of the Planet Koya Koya to leave the planet otherwise he would blast the planet. People ask Lopplc to call Nobita. Lopplc go to the dimensional door and the door blasted. Luckily he got saved. He tells Chammy that he is going to the mining resort. On the other side, Nobita's mother ordered him to study hard and she call Shizuka and Dorami to keep an eye on Nobita. Nobita tells them the whole story and suddenly the dimensional door opens and Chammy gets into it and tells Nobita that Koya Koya is in trouble. Nobita and Doraemon get into the door while Shizuka runs away to call Gian and Suneo. Doraemon and Nobita with help of Chammy go to the resort. There they fight with the miner's robot. Gian and Suneo also helped them and finally the leader fights with Nobita and Nobita shoots him off with his toy gun. The leader presses the auto-destruction button and flees away. Doraemon and Nobita with the help of Lopplc and Morina use the robotic machine to take the destruction device away from planet into the space, where it explodes and due to dimensional distortation they reach to another dimension, where Morina finds his father.
Nobita finds his old teddy bear among the trash after his mother partially cleaned up their shed and tells her not to throw it away. The stuffed animal is a precious gift from his beloved grandmother. Reminiscing about her makes Nobita ask Doraemon to take him back to when he was still three years old and his grandma was still alive.
After watching a televised showing about supposedly humanoid birds spotted in Africa, Nobita dreams of being able to fly with wings. He builds wooden wings after Doraemon refuses to help him, though he repeatedly fails to fly using them. While helping Shizuka to reclaim her pet canary, they witness a portal opens in the sky and a humanoid bird riding an airplane coming out. He introduces himself as Gusuke, a humanoid bird who lives in "Birdopia". Doraemon, Nobita, and Shizuka help Gusuke fix his airplane, where Nobita becomes fast friends with him. As Gusuke departs to his home, Gian and Suneo catch him and grab his plane. The other three follow them through the portal.
The movie starts with Dekisugi expressing his love to Shizuka which makes Nobita cry (even though it was a rehearsal for a play in Nobita's school—Nobita thought that it could influence Shizuka to marry Dekisugi). He goes to Doraemon, asking him to take him to the future to see if he and Shizuka will marry. Nobita and Doraemon travel to the future. When they arrive, they find out that they arrived on the day before the wedding. Future Nobita goes to a hotel and is told that his marriage would be held the next day. Nobita and Shizuka go for a walk but find a lost cat and decide to return it to its owner. But when they arrive near the house, they find out that the owner of the cat is going to fly to America. Nobita and Shizuka then decide to deliver the cat to the airport. When they are on their way to the airport they find Gian and Suneo and give them a lift to the airport. But as they are about to reach the airport, their car runs out of fuel. Nobita and Shizuka run to the airport but find out that the plane had left. Luckily they learn that the cat owner's plane was assigned to a different gate and return the cat to the owner. They go back to the car and Gian invites Nobita to his bachelor party. He goes to the party and after returning he remembers Doraemon and his childhood. All the time he is being followed by Nobita (as a child) and Doraemon. Shizuka's mom advises Shizuka to go to sleep in preparation of the big day. At the end of the story, Shizuka's father has a long talk with the adult Shizuka over her choice of marrying Nobita. Shizuka's father remembers her childhood days and gives his support for her decision. The story ends with Nobita marrying Shizuka.