In the year B.C. 196, the Earth is at peace between Colonies and the Gundam pilots but Wufei is not, as he decides to incinerate the Gundam mecha's by directing them to the Sun, and on Christmas Eve, the Barton Foundation kidnaps Relena Darlian, declaring war on Earth
Quatre Rareba, with help from Maganacs helps to retrieve the Gundams, while Trowa goes undercover as a spy with Dekim's troops. Also, Zechs Merquise who was thought to be dead, launches an all out attack on the base of Dekim.
Heero flies to Earth in the Gundam Zero, but is hampered by Wufei who wants him to fight with him. Everyone feels weak and helpless in the underground fortress and Relena has managed to convince MarieMaia of her error.