Where can I watch “Kim Possible” 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 “Larry's Birthday”?

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

Watch Kim Possible Season 4 Episode 21 Online

“Larry's Birthday” — Watch "Kim Possible" Season 4 Episode 21 online in HD for free. Check streaming providers, cast, and episode details.

Sep 1, 2007 Season 4 Episode 21 22 min G

7.2 ★ ★ ★ ★ ★

4 votes

Kim Possible Season 4

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Season 4 Episode 21 — Aired on Sep 1, 2007 • runs about 22 minutes.

Directed by Steve Loter.

Notable cast/guest names in this episode include Christy Carlson Romano, Will Friedle, Nancy Cartwright, Tahj Mowry.

This page includes 1 official still(s) (when available) plus legal availability links.

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

Synopsis

Kim plans on throwing her cousin Larry a surprise birthday party, but she has to keep him busy until the party is ready. Meanwhile, Dementor enlists the help of his brother-in-law to steal Kim's battlesuit.