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.
Gundam Wing: Endless Waltz was first produced as a 3-part OVA and later compiled into a feature movie, which aired on Cartoon Network in late 2000. Endless Waltz narrates the events of Christmas A.C. 196, one year after the Battle with Libra. A girl who claims to be the daughter of the late Treize Khushrenada, declares war on the newly formed Earth Unified Sphere Nation. Faced with this new threat against peace, the Gundam pilots must once again suit up.