Heero manages to crash-land inside the Libra. Men inside the battleship put out the fire and Heero manages to pose as one of the White Fang soldiers. Now inside, he finds his way to Relena's room and gets her to accompany him to find Zechs. He uses a computer to access his location aboard the Libra.
Heero and Relena find and confront Milliardo. Milliardo states that he will not change his mind and offers Heero a chance to fight alongside him for the colonies. Heero declines and then leaves. The Milliardo they found was actually a holographic image.
Somewhere else onboard the Libra, we see that Treize has a massive build up of mobile suits preparing outside of Earth for an attack. Treize himself is flying in an advanced mobile suit unit. He flies ahead of the rest toward the Libra and asks for a duel against Zechs. After some thought, Zechs fiercely declines the duel offer and orders the Libra to fire.
Dorothy squeals for Zechs to reconsider but Zechs has Quinze detain her as a traitor. Zechs pushes the technician operating the firing mechanism away and pushes the button himself to kill Treize. The Libra fires a charge and just when you think nothing can possibly save Treize, Lady Une flies in the scene in a Gundam she took from Earth and pushes Treize out of the way. The Lady then exits the Gundam and flies into Treize's cockpit.
Things aren't looking too good for the Libra when the episode ends. It will take over an hour for its beam cannon to recharge and it's surrounded by Treize's forces. (And Treize is still alive to boot, now joined by Lady Une.)