In 1933 New York, an overly ambitious movie producer coerces his cast and hired ship crew to travel to mysterious Skull Island, where they encounter Kong, a giant ape who is immediately smitten with the leading lady.
Godzilla has become a distant memory for Japan when the destruction of a US submarine raises alarms for Admiral Tachibana. His estranged daughter Yuri investigates the legend of the guardian monsters, who must rise to protect Japan against the vengeful spirits within Godzilla that seek to destroy both the nation and its people for the suffering they inflicted in the Pacific conflict.
To save the world, Mothra goes back in time in an attempt to defeat a younger King Ghidorah.
The fairies from Infant Island discover a lost city, as well as a giant monster that is attracted to environmental calamities.
The Futurians, time-travelers from the 23rd century, arrive in Japan to warn them of the nation's destruction under Godzilla. They offer to help erase Godzilla from history by preventing his creation. With Godzilla seemingly gone, a new monster emerges as the Futurians' true intentions are revealed.
French nuclear tests irradiate an iguana into a giant monster that viciously attacks freighter ships in the Pacific Ocean. A team of experts, including Niko Tatopoulos, conclude that the oversized reptile is the culprit. Before long, the giant lizard is loose in Manhattan as the US military races to destroy the monster before it reproduces and it's spawn takes over the world.
A special retrospective of the two franchises, with segments making comparisons between the different characters, their weapons, powers and so forth. The final segment of the special is the short film "Super Battle: Ultraman vs Kamen Rider" The main characters, Ultraman and Kamen Rider 1 appear on the scene separately, each fighting an original kaijin and kaiju. When the two monsters are nearly defeated, they merge into a more powerful kaiju. Ultraman experiences trouble and calls for Kamen Rider 1's help. Kamen Rider 1 is then able to grow to enormous size to fight alongside Ultraman.
After the previous Godzilla attack, a miniature arms race ensues to collect his cells. Concerned over Godzilla's possible return, the Japanese government uses the cells to create a new bio-weapon, ANEB (Anti-Nuclear Energy Bacteria). They seeks the aid of geneticist Genshiro Shiragami, who's experiments result in a new mutation.
After a meteorite unleashes a three-headed beast upon Tokyo, Mothra tries to unite with Godzilla and Rodan to battle the extraterrestrial threat.
Humanity finally rids themselves of Godzilla, imprisoning him in an icy tomb in the South Pole. All is peaceful until various monsters emerge to lay waste to Earth's cities. Overwhelmed, humanity is seemingly saved by a race of benevolent aliens known as Xiliens. But not all is what it seems with these bizarre visitors. If humanity wishes to survive, they must reluctantly resurrect their most hated enemy, Godzilla.
A crazy scientist creates a dinosaur hybrid using different genetical material. After the giant monster escapes, it spreads chaos across the laboratory...
Reporter Goro Maki stumbles upon scientists conducting weather experiments on Sollgel Island in the South Seas. He discovers the island is inhabited by giant mantis and a woman named Saeko who's been cast away since the death of her father. The pair soon find a helpless infant monster that Godzilla must adopt and learn to raise as one of his own.
Japan is thrown into a panic after several ships are sunk near Odo Island. An expedition to the island led by Dr. Kyohei Yamane soon discover something far more devastating than imagined in the form of a 50 meter tall monster whom the natives call Gojira. Now the monster begins a rampage that threatens to destroy not only Japan, but the rest of the world as well.
Two fishing scout pilots make a horrifying discovery when they encounter a second Godzilla alongside a new monster named Anguirus. Without the weapon that killed the original, authorities attempt to lure Godzilla away from the mainland. But Anguirus soon arrives and the two monsters make their way towards Osaka as Japan braces for tragedy.
The U.N.G.C.C. (United Nations Godzilla Countermeasure Center) recovers the remains of Mecha-King Ghidorah and construct Mechagodzilla as a countermeasure against Godzilla. Meanwhile, a giant egg is discovered along with a new monster called Rodan. The egg is soon found to be none other than an infant Godzillasaurus.
Five young New Yorkers throw their friend a going-away party the night that a monster the size of a skyscraper descends upon the city. Told from the point of view of their video camera, the film is a document of their attempt to survive the most surreal, horrifying event of their lives.
The mysterious Ultraman, Tregear, has suddenly appeared in Ayaka City. Tregear asks what one would do to make their dreams come true, prompting Katsumi to search for his own dream. As a monster appears for the first time in a year, Ultraman Blu and Ultraman Rosso are joined by Ultraman Geed to face off against this new threat. Walking towards their dream with the heart of the Minato family in hand, Ultraman Gruebe is born.
The advertising director of Pacific Pharmaceuticals, frustrated with the low ratings of their sponsored TV program, seeks a more sensationalist approach. He orders his staff to Faro Island to capture King Kong for exploitation. As Godzilla re-emerges, a media frenzy generates with Pacific looking to capitalize off of the ultimate battle.
Journalists Ichiro Sakai and Junko cover the wreckage of a typhoon when an enormous egg is found and claimed by greedy entrepreneurs. Mothra's fairies arrive and are aided by the journalists in a plea for its return. As their requests are denied, Godzilla arises near Nagoya and the people of Infant Island must decide if they are willing to answer Japan's own pleas for help.
At the turn of the century, all of the Earth's monsters have been rounded up and kept safely on Monsterland. Chaos erupts when a race of she-aliens known as the Kilaaks unleash the monsters across the world.