In 1999, Ishiro Serizawa and his assistant Vivienne Graham were sent by Monarch to the Philippines to investigate the cave-in of a mine. There, they discovered the skeleton of another member of Godzilla's species that died long ago and two parasitic spores, one of which had hatched. The creature that hatched from the spore arrived at the nuclear power plant in Janjira, where it attached itself to the reactor to feed. Monarch quickly quarantined the city of Janjira in order to study the creature, codenamed M.U.T.O.. In 2014, the M.U.T.O. burst free from its cocoon and destroyed Monarch's facilities and flew away. Serizawa and Graham then assisted the U.S. military in tracking and studying the M.U.T.O. and Godzilla once he emerged to hunt it.
Monarch will be featured in the upcoming 2017 King Kong film Kong: Skull Island. The extent of its role is unknown, but it is part of a plan to bridge the film with Godzilla (2014), creating a shared cinematic universe between Godzilla and Kong leading up to Godzilla vs. Kong in 2020.
Monarch was formed in secrecy in 1946 as a joint coalition between several governments in order to hunt and study massive unidentified terrestrial organisms. The first such creature Monarch studied was Shinomura, a deadly hive-minded radioactive creature composed of many smaller composite lifeforms. One of Monarch's operatives, Serizawa, also was intrigued by eyewitness accounts of a "giant lizard that walked like a man" that seemed to be chasing Shinomura throughout the islands. Serizawa called this creature "Gojira," after Pacific Island legends describing him. In 1954, Monarch cooperated with the United States military to lure Godzilla and Shinomura to Bikini Atoll, where both were thought to be killed by the Castle Bravo nuclear bomb "test." Decades later, in 1981, Serizawa told his son Ishiro about his experiences and belief that Godzilla was still alive somewhere. After Ishiro's father died, he was approached by Shaw, a representative of Monarch, who offered him the opportunity to join and continue his father's work. Ishiro Serizawa readily agreed and became part of Monarch.
- According to Godzilla: Awakening, Monarch was the first mixed Japanese-American government unit created since World War II.
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