Where can I watch “Star Trek” Season 3 Episode 23 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 23 Online

“Le Passé” — Watch "Star Trek" Season 3 Episode 23 online in HD for free. Check streaming providers, cast, and episode details.

Mar 14, 1969 Season 3 Episode 23 51 min TV-PG

7.8 ★ ★ ★ ★ ★

37 votes

Star Trek Season 3

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Season 3 Episode 23 — Aired on Mar 14, 1969 • runs about 51 minutes.

Directed by Marvin J. Chomsky.

Written by Jean Lisette Aroeste.

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 23 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

L'Enterprise se prépare à sauver les habitants de la planète Sarpeidon dont l'étoile menace d'exploser. En arrivant sur place, Kirk, Spock et Mc Coy s'aperçoivent que tous les habitants ont déjà fui la planète en se réfugiant dans son passé grâce à un dispositif appelé Atavachron. Kirk se retrouve accidentellement plongé dans un passé de la planète ; Spock et Mc Coy, voulant l'aider, se trouve plongé dans un autre passé.