Date: October 16, 1997 The Jupiter 2 is to launch, but a saboteur wants to destroy it. Unfortunately he is part of the Jupiter 2 Crew now Lost In Space.


(as Tony Leader)


(as S. Bar-David), (created by)

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Episode credited cast:
Will Robinson (as Billy Mumy)
Rest of cast listed alphabetically:
Security Guard


An historic day. The Robinsons - John, Maureen, Judy, Penny and Will - become Earth's first family of outer space, on its way, accompanied by pilot Maj. Don West, to colonize a planet circling Alpha Centauri; however, Dr. Smith, as an enemy agent of a foreign power, means to set them on a course of doom by reprogramming the robot to destroy their ship, the Jupiter 2, eight hours in space. The unfortunate doctor winds up caught in his own treachery and hurls off into space with the Robinson party. His excess weight first throws the ship off course, then, with the robot coming to life and bashing all the controls, they all become "hopelessly lost in space." Written by statmanjeff

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Release Date:

15 September 1965 (USA)  »

Company Credits

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Technical Specs


Sound Mix:

(RCA Sound Recording)

Aspect Ratio:

1.33 : 1
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Did You Know?


For this episode, John Williams (as Johnny Williams) wrote a good deal of incidental music, much of which would be re-used throughout the course of the series. Especially notable is the music that accompanies the zero-gravity scene. Williams dubbed it "The Weightlessness Waltz" and it would be used again many times for fanciful sequences. See more »


During the sabotage rampage, from the point of the Robot riding the elevator upward to the point where Don leaves the side of Maureen and John, the person in the middle of the Don-John-Maureen threesome the rear shots John is in the middle, while in the front shots Maureen is in the middle. See more »


Narrator: The Robinson family was selected from more than two million volunteers for its unique balance of scientific achievement, emotional stability and pioneer resourcefulness. They will spend the five and a half years of their voyage frozen into a state of suspended animation, which will terminate automatically as the spacecraft enters the atmosphere of a new planet.
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Featured in Lost in Space: The Time Merchant (1968) See more »

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User Reviews

This is the best of the best..10.0..
26 September 2012 | by (United States) – See all my reviews

Well, I just discovered this site and all the feedback and information I can add. I plan to make plenty of comments, reviews, opinions, quotes and such in the months to come. One quick correction from the credits listed above on this site...Byron Morrow and Hoke Howell do NOT obviously appear anywhere during this episode. Don't know what somebody is thinking. I've seen this error before. Byron Morrow and Hoke Howell were guests far away in a Season Three episode entitled, "Time Merchant", which has absolutely nothing to do with this beauty. "The Reluctant Stowaway" is the best the series had to offer. All of classic B&W Season One is one of the very best years in television history. It's all galactic, out of this world adventure. Nothing in the series, or many other series, can approach this greatness. This is my input #1!

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