While spacewalking Doctor Robinson is pulled down onto a planet. Major West lands the ship to search for him.


(as Tony Leader)


(teleplay by), (story by) | 1 more credit »

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Episode cast overview:
Will Robinson (as Billy Mumy)


When John Robinson loses control of his spacewalk and falls onto a nearby planet, Dr. Smith, in command of the Robot, immediately tries to force Don and Maurine into returning to Earth rather than going after John. Thanks to some quick thinking, Smith's takeover is thwarted and the Jupiter II braces for a crash landing. Finding the planet cold but habitable, Don and the Robinsons venture out in their chariot to find John, believing they've left Dr. Smith under control. They haven't, and the scheming Doctor continues to lay plans with the robot against the Robinsons. Written by statmanjeff

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Release Date:

29 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?


The title may be based on the movie Island in the Sky (1953), starring John Wayne. There may be other sources, including a 1952 science fiction novel by Arthur C. Clarke. See more »


When West and the family take off in the Chariot to go look for John, the tracks in the sand start when the Chariot moves. Since it had to be assembled and parked by the hatch, where are the tracks from wherever it was unloaded from the ship to that point? See more »


Dr. Zachary Smith: [to the Robot] Only one person is currently if use to us - Major Don West. "Useful" because he's the only one who can pilot this spaceship. Since the others serve no purpose, they must be liquidated. When we have learned what we need to know from Major West, he will be liquidated as well. With me, so far?
The Robot: Affirmative. Destroy everyone.
Dr. Zachary Smith: Well, now, that's hardly a delicate way of putting it. I prefer the term "eliminate." It's so much tidier.
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Featured in Pioneers of Television: Science Fiction (2011) See more »

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User Reviews

More Outstanding Adventure
7 February 2015 | by See all my reviews

The Jupiter 2 crash lands on an alien planet.

Another totally outstanding episode of Lost In Space. Just a tiny drop in quality compared to the last two episodes (The Reluctant Stowaway and The Derelict) as the really big events have happened now...the ship has blasted off, it got lost in space, they all found out that Smith is a creep and they had their first encounter with space aliens.

But don't worry, there are still more things to happen...a Jupiter 2 crash landing on an alien planet and the Robot starts talking a lot more. Jonathan Harris as Smith continues to be outstanding.

More wonderful John Williams music as well.

Fans of Irwin Allen's Voyage to the Bottom of the Sea will get a thrill out of the Jupiter 2 crash as it was filmed exactly the same way as the endless flying sub footage in Voyage...in real daylight. Effects man Howard Lydecker is the man responsible for the flying sub/Jupiter 2 effects.

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