Lost in Space (1965–1968)
8 user 1 critic

The Anti-Matter Man 

John Robinson and Don West are transported onto a strange new world where their evil opposites exist and plan to change places with them. Will, The Robot and a reluctant Dr. Smith set out ... See full summary »


Sutton Roley


K.C. Alison, Irwin Allen (created by)

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Episode complete credited cast:
Guy Williams ... Prof. John Robinson
June Lockhart ... Maureen Robinson
Mark Goddard ... Don West
Marta Kristen ... Judy Robinson
Bill Mumy ... Will Robinson (as Billy Mumy)
Angela Cartwright ... Penny Robinson
Jonathan Harris ... Dr. Zachary Smith


John Robinson and Don West are transported onto a strange new world where their evil opposites exist and plan to change places with them. Will, The Robot and a reluctant Dr. Smith set out to find and help the real Don and John only to be pursued by a evil John Robinson. Written by Trail Boss

Plot Summary | Add Synopsis


Not Rated | See all certifications »




Release Date:

27 December 1967 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:

Mono (RCA Sound Recording)



Aspect Ratio:

1.33 : 1
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Did You Know?


This alternative universe episode follows Star Trek: Mirror, Mirror (1967), broadcast two months earlier. The premise of the episode is practically identical to the Star Trek episode. See more »


When Dr Smith is left alone on the path in the Anti-matter world by the robot, shadows from the tree branches in the foreground can be seen on the fake mountains & sky in the background. See more »


Featured in Pioneers of Television: Science Fiction (2011) See more »


Swing Low, Sweet Chariot
Written by Wallis Willis
Performed by Dick Tufeld
See more »

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User Reviews

The best episode of the final season?
3 May 2007 | by zebulonguySee all my reviews

Anti Matter Man is a wonderful, almost perfect episode. It stands out in an erratic season of episodes. Some of this season had good shows , but it also featured some truly low points ( A day at the zoo, Great vegetable rebellion, to name just 2!) But this episode is superior to any other 3rd season show, Sutton Roley directs assuredly and imaginatively from a script by K.C.Alison ( Robert Hamner and Barney Slater )It is a great pity Roley only did a handful of episodes- everyone he did was good if not great. The story may sound old hat- John Robinson is transported to the anti matter world inhabited by his evil alter-ego, leaving John there in the custody of Don West's alter-ego- the double takes John's place with his family.This episode really is tense, grim and features the comedy scenes in the right proportions and not too often. Several scenes stand out- the evil John virtually clubbing The Robot to pieces, again the evil John stalking Will Robinson through space on an eerie stairway of mist and light, the 2 John's fighting in space amongst a myriad of lights.Dr. Smith, Will and The Robot travel to the anti matter world to find the real John Robinson, their adventures along the way are fascinating.A prime example of the perfect Lost In Space. Check it out.

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