Where can I watch “Lost in Space” Season 3 Episode 15 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 Lost in Space Season 3 Episode 15 Online

“The Anti-Matter Man” — Watch "Lost in Space" Season 3 Episode 15 online in HD for free. Check streaming providers, cast, and episode details.

Dec 27, 1967 Season 3 Episode 15 60 min TV-PG

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Lost in Space Season 3

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Season 3 Episode 15 — Aired on Dec 27, 1967 • runs about 60 minutes.

Directed by Sutton Roley.

Written by Robert Hamner.

Notable cast/guest names in this episode include Guy Williams, June Lockhart, Mark Goddard, Marta Kristen.

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

Looking for “watch Lost in Space Season 3 Episode 15 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Professor Robinson is caught in a matter transfer emission ray, and subsequently ends up in another dimension where he is confronted by a version of himself and Don. However this realm is the opposite of his own dimension, the anti-matter world, where everything in reality is twisted. The evil John returns to the family and attempts to take over the Robinsons and take over John's life. Will he get away with it, or are Will and the Robot able to defeat him, and restore the world to it's natural order.