Chuck-Zilla is a giant evil version of Uncle Chuck. He has red-X marks for eyes, and has the same appearance of Uncle Chuck, but only much more robotic than his counterpart.
In this universe, Chaos Emerald radiation transformed Chuck into a hideous, gigantic monster that threatened the people of Doctor J. Kintobor's city, Kintopolis. When Chuck-Zilla invaded the city, Mayor Kintobor infected him with a robo-virus, thus paralyzing Chuck-Zilla. It can be presumed that Chuck-Zilla is dead. (SSS: #12)