Where can I watch “Sword Art Online” Season 4 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).

Do I need to watch earlier episodes before “Beyond Time”?

Watching earlier episodes in season 4 helps you follow the plot and character arcs leading into this episode.

Watch Sword Art Online Season 4 Episode 21 Online

“Beyond Time” — Watch "Sword Art Online" Season 4 Episode 21 online in HD for free. Check streaming providers, cast, and episode details.

Sep 6, 2020 Season 4 Episode 21 23 min MA15+

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Sword Art Online Season 4

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Season 4 Episode 21 — Aired on Sep 6, 2020 • runs about 23 minutes.

Directed by Tomonari Tanaka.

Written by Muneo Nakamoto.

Notable cast/guest names in this episode include Yoshitsugu Matsuoka, Haruka Tomatsu, Hiroaki Hirata, Ai Kayano.

This page includes 2 official still(s) (when available) plus legal availability links.

Looking for “watch Sword Art Online Season 4 Episode 21 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

The maximum-acceleration phase has begun. Alice successfully logs out of the Underworld, but Kirito doesn’t make it in time. In the real world, Higa and Kikuoka rush to shut down the STL, in order to disable the maximum-acceleration phase, but…