Where can I watch “The Flash” Season 1 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 1 helps you follow the plot and character arcs leading into this episode.

Watch The Flash Season 1 Episode 18 Online

“Twin Streaks” — Watch "The Flash" Season 1 Episode 18 online in HD for free. Check streaming providers, cast, and episode details.

Apr 13, 1991 Season 1 Episode 18 45 min TV-PG

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The Flash Season 1

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Season 1 Episode 18 — Aired on Apr 13, 1991 • runs about 45 minutes.

Directed by James A. Contner.

Written by Stephen Hattman.

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 The Flash Season 1 Episode 18 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

A scientist and his business partner are trying to develop a being with super speed, their attempts fail. They manage to clone the Flash. Their creation learns quickly, but is emotional moral equivalent of a child. Barry must stop his twin.