Where can I watch “Flash” Season 1 Episode 20 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 “Le chant des sirènes”?

Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch Flash Season 1 Episode 20 Online

“Le chant des sirènes” — Watch "Flash" Season 1 Episode 20 online in HD for free. Check streaming providers, cast, and episode details.

May 4, 1991 Season 1 Episode 20 45 min TV-PG

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Flash Season 1

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Season 1 Episode 20 — Aired on May 4, 1991 • runs about 45 minutes.

Directed by Mario Azzopardi.

Written by Jim Trombetta.

Notable cast/guest names in this episode include John Wesley Shipp, Amanda Pays, Alex Désert.

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

Looking for “watch Flash Season 1 Episode 20 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Quand le corps d'un criminel présumé mort disparaît, Barry est suspecté. Le criminel a inventé une machine qui produit des sons étrange et qui plonge n'import quelle personne qui l'entends dans un sommeil profond.