Zilla is the american version of Godzilla that appeared in the 1998 film, renamed for his appearance in Godzilla: Final Wars. He is in the film for the sole purpose of getting killed by the real Godzilla, though he does get a fairly large role in the part of the film where monsters attack worldwide. He attacks Sydney, Australia.
He is often disparagingly referred to by fans as GINO, an acronym for "Godzilla In Name Only."