In the real world
- The mascot of G-Fan, Gfantis, is created by Dave Filoni.
- Mystery Science Theater 3000 is cancelled after 10 seasons, 11 years, and more than 190 episodes.
- Godzilla 2000: Millennium, the first of six entries in the Millennium series of Godzilla films, is released to Japanese theaters on December 11. It is the sixth and final Toho-produced Godzilla film to be released in the 1990's and the only one to not be a part of the Heisei series.
- Reptilian is released to South Korean theaters on July 17.
- Gamera 3: Revenge of Iris, the third and final entry in the Heisei Gamera trilogy, is released to Japanese theaters on March 6.
- Godzilla Generations: Maximum Impact, the sequel to the previous year's Godzilla Generations, is released on December 23 for the Sega Dreamcast.
In the Kaiju Multiverse
- All of Earth's giant monsters (including Godzilla, Mothra, Rodan, Anguirus, Minilla, Baragon, Gorosaurus, Manda, Kumonga, and Varan) have been gathered up and are now living on an island in the Ogasawara chain dubbed Monsterland, where they are monitored and studied by the world's scientists. An alien race called the Kilaaks take control of all of the monsters and send them to attack the world's major cities. The monsters are eventually freed from control, and they team up to fight the monster King Ghidorah. After a long fight, the monsters actually kill the space hydra and humanity is successful in defeating the aliens once and for all. The monsters are returned to Monsterland, where they are left to live their lives in peace (Destroy All Monsters — U.S. version. In the Japanese version, the movie is only said to be set "at the end of the 20th century.")
- Evolved Hyper Gyaos begin to appear across the world en masse. Gamera is driven to the brink as he struggles desperately to combat the horde, unintentionally causing many civilian deaths, culminating in a disastrous battle with two Gyaos in Shibuya. The JSDF declares Gamera its enemy and begins to move against him. Meanwhile, Ayana Hirasaka, a high school student orphaned along with her younger brother after her parents were killed during Gamera's 1995 battle with Super Gyaos in Tokyo, discovers a stone egg within a shrine in the village of Minami-Asuka, Nara. The egg, held by local folklore to be a demon called the Ryuseicho, hatches into a bizarre creature which Ayana names "Iris" and chooses to raise to take revenge against Gamera for her. As Iris grows it attempts to fuse itself with Ayana, though this fusion is interrupted and Ayana is transported to a hospital and later brought to Kyoto by occultist government official Mito Asakura and her accomplice Kurata Shinya. Iris goes berserk and murders the majority of the village population. Mayumi Nagamine investigates the devastation to learn that Iris is virtually genetically identical to Gyaos. The JSDF encounters Iris not far away, and finds it now grown into a colossal monster. The platoon assaults Iris, but the beast retaliates and slaughters virtually all of the soldiers before taking flight and heading to Kyoto to reunite with Ayana. Nagamine teams up with Asagi Kusanagi to get Ayana away from Asakura and out of Kyoto, but they are trapped at Kyoto Station as a typhoon strikes the city. The JASDF engages in a dogfight with Iris as it approaches the city, which Gamera soon joins. The pilots are ordered to attack Gamera instead, allowing Iris to land in Kyoto. Gamera arrives after him and the two kaiju engage in a savage fight to the death. Iris seemingly kills Gamera by impaling him through the chest with its spear-tipped arm and again tries to fuse with Ayana, this time against her will. Still alive, Gamera punches through Iris' chest and rescues Ayana, only for his foe to impale his other hand against the wall. As Iris drains Gamera's blood and launches copies of his plasma fireballs, Gamera severs his trapped hand with a fireball of his own and absorbs the plasma to form a fiery fist from his stump arm. Gamera plunges the fist into Iris' wounded chest, killing it. Gamera sets Ayana down next to Asagi and Nagamine and prepares to face a swarm of Hyper Gyaos descending upon the city. The JSDF changes its target to the Gyaos, and Asagi is certain Gamera will not be alone in this fight. (Gamera 3: Revenge of Iris)
- 45 years after the first Godzilla attack, a second Godzilla rises and raids Tateyama, Japan. In response, the Japanese government passes a bill for the creation of a new weapon designed to kill the beast. The JSDF recovers the skeleton of the original Godzilla from the bottom of Tokyo Bay, and scientists successfully extract living stem cells from the remains. With a powerful DNA computer ready, and the skeleton to be used for structure, work begins on the construction of a cybernetic Godzilla robot, a "Mechagodzilla" to be used to eradicate the new Godzilla for good. (Godzilla Against Mechagodzilla)
- Aliens resurrect a giant prehistoric creature dubbed Yonggary. However, they lose control of the ancient reptile and send forth their ultimate monster Cykor to destroy humanity. Fortunately, Yonggary fights and defeats Cykor, saving the Earth and the human race. (Reptilian)
- The new Godzilla, along with the members of H.E.A.T., continues to fight monstrous mutations in defense of humanity. (Godzilla: The Series)
- A deadly mine collapse in the Philippine Highlands on March 10 leads to a subterranean hazmat investigation, led by Monarch's Dr. Ishiro Serizawa and his assistant Dr. Vivienne Graham. A larval male MUTO, who had hatched after being disturbed by the cave collapsing, burrows his way to the Janjira nuclear power plant in Japan, where he causes the plant to collapse from underneath, killing a number of power plant workers, including Sandra Brody. (Godzilla)
- Kamacuras attacks the Boston and New York City areas, causing 2.5 million deaths. The beast is eventually killed by bunker buster bombs in New Hampshire after a delayed military response. (GODZILLA: Planet of the Monsters)
This is a list of references for 1999. These citations are used to identify the reliable sources on which this article is based. These references appear inside articles in the form of superscript numbers, which look like this: 
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