Do I need to watch earlier episodes before “Sozin's Comet: Avatar Aang (4)”?

Watching earlier episodes in season 3 helps you follow the plot and character arcs leading into this episode.

Watch Avatar: The Last Airbender Season 3 Episode 21 Online

Q: Where can I watch “Avatar: The Last Airbender” Season 3 Episode 21 online?

This page provides episode info and a legal-only guide. It does not host streams or downloads. Check official platforms and licensed services for availability in your region (US first).

“Sozin's Comet: Avatar Aang (4)” — Watch "Avatar: The Last Airbender" Season 3 Episode 21 online in HD for free. Check streaming providers, cast, and episode details.

Jul 19, 2008 Season 3 Episode 21 24 min TV-Y7

9.4 ★ ★ ★ ★ ★

69 votes

Avatar: The Last Airbender Season 3

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Season 3 Episode 21 — Aired on Jul 19, 2008 • runs about 24 minutes.

Directed by Joaquim Dos Santos.

Written by Aaron Ehasz, Michael Dante DiMartino.

Notable cast/guest names in this episode include Zach Tyler Eisen, Mae Whitman, Jack De Sena, Dante Basco.

This page includes 3 official still(s) (when available) plus legal availability links.

Looking for “watch Avatar: The Last Airbender Season 3 Episode 21 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Aang is on the offensive after getting hit in the back of his scar and triggering the Avatar State. Meanwhile, after Zuko seems to have the upper hand against Azula, Katara is forced to join the fight when Azula resorts to desperate measures.