Avatar: The Last Airbender, Season 1

Zhao:
Don't bother. [he raises his fist, aiming at Tui]

Aang:
[drops his staff] Zhao! Don't.

Zhao:
It's my destiny: to destroy the Moon, and the Water Tribe.

Aang:
Destroying the Moon won't hurt just the Water Tribe. It will hurt everyone... including you. Without the Moon, everything will fall out of balance! You have no idea what kind of chaos that would unleash on the world!

Iroh:
He is right, Zhao!

Zhao:
General Iroh. Why am I not surprised to discover your treachery?

Iroh:
[sharply] I'm no traitor, Zhao. The Fire Nation needs the Moon, too! We all depend on the balance. [takes up a fighting stance] Whatever you do to that Spirit, I'll unleash on you tenfold! Let it go, NOW!

[Zhao reluctantly returns Tui to its pool, then yells in fury and Firebends, killing Tui and causing the Moon to vanish. Iroh yells in rage and attacks Zhao and his guards with Firebending; he easily defeats all four of the guards, while Zhao runs away. Aang and his friends watch, stunned, as Iroh picks up Tui's body.]

Princess Yue:
...There's no hope now. It's over.

[Aang enters the Avatar State]

Aang:
... No. It's not over.

[Aang steps into the Spirit Oasis, fusing with La, the spirit of the Ocean.]