Where can I watch “Wonder Woman” Season 3 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).

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Watching earlier episodes in season 3 helps you follow the plot and character arcs leading into this episode.

Watch Wonder Woman Season 3 Episode 20 Online

“The Boy Who Knew Her Secret (1)” — Watch "Wonder Woman" Season 3 Episode 20 online in HD for free. Check streaming providers, cast, and episode details.

May 28, 1979 Season 3 Episode 20 50 min PG

6.5 ★ ★ ★ ★ ★

2 votes

Wonder Woman Season 3

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Season 3 Episode 20 — Aired on May 28, 1979 • runs about 50 minutes.

Directed by Leslie H. Martinson.

Written by Anne Collins.

Notable cast/guest names in this episode include Lynda Carter, Lyle Waggoner.

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

Looking for “watch Wonder Woman Season 3 Episode 20 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Alien life-forms shaped like small pyramids come to earth and imprison the minds of humans who touch them, taking over a small town. Meanwhile, Diana isn't as careful as she should be.