1957

In the real world

 * Attack of the Crab Monsters was released in the United States on February 10.
 * Kronos was released in the United States on April 21.
 * The Deadly Mantis was released in the United States on May 26.
 * 20 Million Miles to Earth was released in the United States in June.
 * The Black Scorpion was released in the United States on October 11.

In the giant monsters' multiverse

 * Giant crab monsters attack settlements in the Pacific Ocean.
 * Kronos attempts to destroy the Earth.
 * Giant mantis attacks Washington, D.C.
 * Ymir attacks the Earth.