where did the live action avatar the last airbender season 1 end vs the cartoon

The live-action Avatar: The Last Airbender season 1 ends around the Northern Water Tribe / Siege of the North storyline, which is the same big finish as the cartoon’s Book 1 finale, but with some storylines rearranged and compressed. In the Netflix version, the season ends after the battle at Agna Qel’a, Princess Yue’s sacrifice, Zhao’s apparent defeat, and the tease that Sozin’s Comet is returning soon.

Where it matches the cartoon

• The cartoon’s Book 1 also ends at the Northern Water Tribe arc, with the Fire Nation attack, the Moon Spirit crisis, and Aang entering the Avatar State.

• Both versions use that finale to close out the Water Tribe part of the journey and point toward the Earth Kingdom next.

What the live action changes

• The live-action season adds or reshapes several events before the finale, so it does not line up scene-for-scene with the cartoon.

• It also leaves some setup for later seasons a bit differently, especially by introducing the comet as a future deadline rather than the cartoon’s more constant Book 1 backdrop.

Simple version

The cleanest answer is: season 1 of the live-action show ends where the cartoon’s Book 1 ends, at the Northern Water Tribe finale, but with a more compressed and reworked path getting there.