The ship was first seen hovering over Tokyo when the Xiliens made contact with the EDF. After the Xiliens' plans were uncovered, the mothership discharged fighters and the Xilien UFOs Alpha, Beta and Gamma to attack the Earth's forces and release monsters. The mothership was later attacked by the Gotengo, which drilled through the hull. After the Xiliens on board were defeated, the ship was sent into self destruct, and exploded. Residual energy from the ship's explosion showered onto the now-beaten down Monster X, allowing him to transform into Keizer Ghidorah.
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