The Descending Sword
Operation Spitbreak is initiated, with both ZAFT and the Earth Alliance believing they have outsmarted the other. The Archangel is left behind to be destroyed in a calculated plan that would decimate everyone on the battlefield, until Kira arrives to save them.
Aired 07/06/2003EP 35 - The Descending Sword

Mobile Suit Gundam Seed
C.E. 71: In the midst of war between the Naturals (OMNI) and Coordinators (ZAFT), a unit from ZAFT is dispatched to hijack the Earth Alliance's newly developed mobile suits on the neutral colony of Heliopolis. Orb Civilian Coordinator Kira Yamato attends the technical college on Heliopolis. After ZAFT hijacks 4 of the 5 mobile suits, Kira stumbles upon the last one, Strike, forced to pilot it to save his and his friend's lives. During this confusion, Kira also reunites with his childhood Coordinator friend, Athrun Zala, who ironically turns out to be a ZAFT soldier and one of the hijackers at Heliopolis. Having control of Strike, Kira joins the Earth Alliance boarding the ship known as Archangel, to protect his friends while despairing over becoming the enemy of his childhood friend and people.
Note: An HD remaster was broadcasting starting on December 23, 2011 with two recap episodes cut, including new and updated animation, conversion to 16:9, and updated music.