Mobile Suit Gundam Wing S00 E07 Endless Waltz: Return to Eternity

Mariemaia's forces descend on Brussels, the ESUN's capital, where Mariemaia, her grandfather and Relena go into a huge, super-armored bunker. Meawhile, Zechs and Lucrezia Noin try, without success, to stop Mariemaia's MS troops, until the Gundam Heavyarms, Sandrock and Deathscythe H arrives, that is, with the only two missing Gundams duking it out during atmospheric re-entry.