Monique Dupre: “What is that thing?”

Elsie Chapman: “Oh, just a little something me and the aliens whipped up.”

― Monique and Elsie discussing Cyber Godzilla in "Monster Wars: Part 3"

The result of the Leviathan Aliens recovering and cybernetically reviving the carcass of the first Godzilla, Cyber Godzilla was the centerpiece of the aliens' planned invasion of Earth. They first released the cyborg to intercept its son, using its parental influence to bring him under the aliens' control. Cyber Godzilla was then set loose on Tokyo as the aliens' other mind-controlled monsters assaulted other major cities around the globe. Cyber Godzilla was eventually killed after the current Godzilla's surrogate father Niko Tatopoulos freed him from the aliens' mind control and convinced him to fight his biological father.