When the Xilien's leader - known as "X" - learns about Godzilla and the power the creature possesses after the Monster King battles and seemingly kills Gigan by blasting off its head, X summons Monster X to Earth - with the creature concealed inside an asteroid and under the Xilien's control. It's presumed that Keizer Ghidorah is capable of flight, despite not flying during the battle with Godzilla. Furthermore, the monster can still live with just one head if the other two are decapitated or destroyed.