

When the Xilien Mothership self-destructed, Monster X transformed into the immensely powerful Keizer Ghidorah, which nearly killed Godzilla before the Gotengo intervened and gave Godzilla a surge of energy that allowed him to triumph over his extraterrestrial foe. Monster X was briefly joined by Gigan, but Mothra soon arrived and sacrificed herself to destroy Gigan, leaving only Monster X and Godzilla.

Monster X initiated combat with Godzilla, and proved to be a considerably more challenging opponent than the rest of the Xiliens' monsters. The last and most powerful of the Xiliens' legion of monsters, Monster X arrived on Earth concealed inside the Gorath asteroid, which was shot down by Godzilla over Tokyo. Monster X (モンスター X ( エックス ), Monsutā Ekkusu), also known as his transformation Keizer Ghidorah (カイザーギドラ, Kaizā Gidora), is a skeletal three-headed dragon kaiju who first appeared in the 2004 Toho Godzilla film Godzilla Final Wars. Controller of Planet X, before unleashing Monster X ( Godzilla Final Wars)
