Collapsing Land
Lt. Murrue Ramius takes over as captain of the Archangel and Kira and his friends are detained for seeing top secret military weapons. Rau Le Creuset is determined to capture the Strike after seeing how well it moved and sends out mobile suits to retrieve it. Disobeying orders, Athrun also dispatches so he could confirm if Kira is the one piloting the Strike, but when he finds his answer, Heliopolis crumbles as it sustains too much damage.
Aired 19/10/2002EP 3 - Collapsing Land

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.