Where can I watch “Star Trek” Season 3 Episode 18 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 3 helps you follow the plot and character arcs leading into this episode.

Watch Star Trek Season 3 Episode 18 Online

“Les Lumières de Zetar” — Watch "Star Trek" Season 3 Episode 18 online in HD for free. Check streaming providers, cast, and episode details.

Jan 31, 1969 Season 3 Episode 18 51 min TV-PG

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Star Trek Season 3

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Season 3 Episode 18 — Aired on Jan 31, 1969 • runs about 51 minutes.

Directed by Herbert Kenwith.

Written by Shari Lewis, Jeremy Tarcher.

Notable cast/guest names in this episode include William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan.

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

Looking for “watch Star Trek Season 3 Episode 18 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

L'Enterprise est chargé de transporter le lieutenant Mira Romaine vers la planète-bibliothèque Memory Alpha. En arrivant sur place, Kirk s'aperçoit que tout le personnel de la station a été tué par une entité lumineuse qui prend alors possession du corps du lieutenant Romaine.