The Godzilla franchise debuted with the 1954 Japanese film Godzilla (Gojira). Since then, Japan and the rest of the world have known and become quite fascinated with Godzilla and the franchise the first film created. Future Godzilla movies would create creatures to act as foils and/or rivals to Godzilla as time passed.
Source：https://www.cbr.com/godzilla-strongest-weakest-monsters/
