Where can I watch “Smallville” Season 10 Episode 10 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).

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Watching earlier episodes in season 10 helps you follow the plot and character arcs leading into this episode.

Watch Smallville Season 10 Episode 10 Online

“Luthor” — Watch "Smallville" Season 10 Episode 10 online in HD for free. Check streaming providers, cast, and episode details.

Dec 3, 2010 Season 10 Episode 10 42 min TV-14

8.2 ★ ★ ★ ★ ★

10 votes

Smallville Season 10

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Season 10 Episode 10 — Aired on Dec 3, 2010 • runs about 42 minutes.

Directed by Kelly Souders.

Written by Bryan Q. Miller.

Notable cast/guest names in this episode include Tom Welling, Erica Durance, Cassidy Freeman, Justin Hartley.

This page includes 4 official still(s) (when available) plus legal availability links.

Looking for “watch Smallville Season 10 Episode 10 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Tess acquires a Kryptonian box that once belonged to Lionel Luthor. When Clark accidentally activates the box, he’s transported to a parallel universe where Lionel found Clark in the cornfields instead of the Kents. In this universe, Clark Luthor is a murderer and Lois is engaged to Oliver and both of them hate Clark. Clark must be careful not to tip off Lionel that he’s not his son while trying to figure out how to get back to Earth where the monster Clark Luthor was transported in his place.