Kaiju is a Japanese term that is commonly associated with media involving giant monsters. A subgenre of science fiction, it was created by Eiji Tsuburaya and Ishirō Honda. The term can also refer to the giant monsters themselves, which are usually depicted attacking major cities and battling either the military or other monsters.

Eiji Tsuburaya was a Japanese special effects director, filmmaker, and cinematographer. A co-creator of the Godzilla and Ultraman franchises, he is considered one of the most important and influential figures in the history of cinema. Known as the "Father of Tokusatsu", he pioneered Japan's special effects industry, introducing several technological developments in film productions. In a career spanning five decades, Tsuburaya worked on approximately 250 films—including globally renowned features directed by Ishirō Honda, Hiroshi Inagaki, and Akira Kurosawa—and earned six Japan Technical Awards.