The movie's plot involves Nobita, who throws a temper tantrum because he wants a really large RC toy robot in order to upstage the rich kid, Suneo, who has been showing off the new robot that his cousin made. His fit makes Doraemon angry and he uses his Anywhere Door to get anyway from the summer heat cool off at the North Pole. Sometime later, Nobita follows and a discovers a strange bowling ball-like orb which starts blinking with a pulsating light, and summons what looks like a giant robot´s foot. After Nobita uses the foot to sled down, crashing into his room through the Anywhere Door, the bowling ball follows him home through the door and another robot piece falls into his backyard. A frozen Doraemon follows soon after, covered in ice before being thawed out and with a cold. Learning of the robot parts, Doraemon admits to Nobita that he has nothing to do with it as the two use the Opposite World Entrance Oil and the Roll-Up Fishing Hole to enter the World Inside the Mirror, an alternate mirror world without people. There, they built the robot which Nobita christens the name "Zanda Claus" as he believed the sphere summoning the parts is from Santa Claus.
Jarrod and his girlfriend Elaine have flown to Los Angeles for Jarrod's best friend Terry's birthday party. They celebrate with Terry's wife, Candice, and his assistant, Denise. During the party, one of Terry's employees, Ray, welcomes Jarrod to L.A., thinking he has moved there to join Terry's special effects company. During a private argument about whether or not they should move, Elaine reveals she is pregnant.
After a NASA deep-space probe (sent to verify the existence of extraterrestrial life within the solar system) crash lands in Mexico, extraterrestrial life forms spread throughout the Mexico–United States border region, leading to the quarantine of the northern half of Mexico. US and Mexican troops battle to contain the creatures, and a wall stretching along the American border ostensibly keeps the US protected.
A man walks over to a trash can, puts a 1980s-era television by it, and leaves. A few seconds go by, then the TV turns on and shows colored bars. An 8-bit picture of a bomb shows up and the simulated fuse runs out, causing the TV screen to shatter, releasing a cloud of pixels (illustrated as voxels because of the three-dimensionality of the scene). The pixels fly over to New York City and head in various directions.
Two years after the second season, an unknown alien fragment landed on a research station and reactivates it, causing it to head towards Earth. In Celestial Being's Asteroid Base, Ian Vashti greets his wife, Linda, after her 2-year assignment and unloads two new GN Drives and a new incomplete Gundam, the GNT-0000 00 Qan[T].
Chapman University hosts a televised interview with psychologist Dr. Abigail Tyler (Milla Jovovich/Charlotte Milchard). She tells a story of a close encounter incident at Nome, Alaska, in October 2000.
In 17,000 B.C., the Seven Primes traveled the galaxy to create Energon with star-absorbing machines called Sun Harvesters. The Primes followed a rule in which to never destroy planets with life, but one of them, later called The Fallen, deceives the others by building an army and sets up a Harvester on Earth. After defeating ancient humans, the Primes defeat and imprison the Fallen before he can harvest the Earth's sun with the Matrix of Leadership. The rest of the Primes sacrifice themselves to hide the Matrix.
Giant robots appear out of the mist and attack Montevideo, the capital of Uruguay. Accompanied by a squadron of spacecraft, they fire weapons at the city and destroy key buildings, leading to mass panic. The military fights back to little avail. At the end of the film, the robots fuse together to form a giant sphere, which then detonates and engulfs the city in a fireball. No explanation is given for the attack.
Taking place three hundred years prior to the events of the first film, the narrator describes how the government knew what was happening. A woman is seen driving recklessly in California while arguing over her cell phone. Police officer Ryan Hadley (Bruce Boxleitner) pulls her over and gives her a warning. The man calls her back, but she tells him off and throws the phone down; the phone then transmorphs into a robotic spider and kills her.
Just as the local grocery store is about to close, a group of six armed, masked people enter the building. They take the staff and remaining customers hostage and immediately shoot down one of the employees. One of the masked men named Spooky is then told to check whether "he" is among the hostages. When he identifies a woman as one of "them", she tries to escape but is shot down. Meanwhile, a police officer, who was also inside the store, manages to kill one of the masked men. He then calls for back-up and shoots Spooky, who hasn't managed to check all hostages yet. The cop is then killed too.
In the past eleven years of "The Second Bug War", the Mobile Infantry has improved their weapons and tactics. However, as they adapt, so do the Bugs, and many new Arachnid variants have developed. The United Citizen Federation now finds itself engaged in trench warfare on the frontier planets. The Federation puts a positive spin on this in the media while using its judicial and military authority to suppress peace protesters and religious fanatics as seditionists.
George Herbert explains that despite years of searching for extraterrestrial life, mankind never expected the invasion which devastated human civilization into anarchy, and that the aliens were killed by a lack of immunity to the bacteria in the human blood they consumed. Two years later, a town is seen, populated with silent refugees including characters Shackleford and Sissy. Suddenly, three Tripods land in the city. People are struck by a Heat-Ray. Shackleford takes a sample of Sissy's blood, with which he injects himself.