Monster X, also known as Keizer Ghidorah, is a kaiju that first appeared in Toho's Godzilla: Final Wars. Although Monster X is a similar species to King Ghidorah, the two are not the same and have separate trademarks, owing to the drastically different abilities between them.
The world has faced many threats, Invasions from other worlds, robots from space, kaiju that are from a rift in the sea, and Angels. But in the face of overwhelming catastrophe, heroes who face these threats separately must come together to stop it.