The Keeper is an alien who travels the galaxy collecting living pairs of interesting or rare animals. His courtly overtures towards the Robinsons belie his true intention -- to add a pair of humans to his incredible menagerie.



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Episode complete credited cast:
Judy Robinson
Will Robinson (as Billy Mumy)


The Keeper, a collector of animal specimens, comes to the planet to collect two of every kind. The Robinson party only becomes aware of his presence after Dr. Smith is ultra-sonically mesmerized into entering one of his cages. The Keeper, who can be as charming as he is condescendingly arrogant, eventually comes to see the Robinsons and thereafter sets out to add a couple of them to his collection. Written by statmanjeff

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Release Date:

12 January 1966 (USA)  »

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Technical Specs


Sound Mix:

(RCA Sound Recording)

Aspect Ratio:

1.33 : 1
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Did You Know?


Will wants to to know how The Keeper (Michael Rennie) is able to speak English. He says that he learned it from listening to broadcasts he had picked up from Earth. Coincidental or not, this is identical to an explanation that Klaatu (also played by Rennie) gave in the classic The Day the Earth Stood Still (1951). There is also a pattern of Rennie playing alien analogues of Biblical heroes: in "Day" his character was analogous to Jesus, in "Keeper" he serves the function of Noah. See more »


When the Keeper first appears to the group of space travelers and walks up to them, he asks Will "[is there] Something wrong?" At that time Will is leaning over the cage, his forearms resting upon it. Then the image transitions to a two-shot close-up of Will and Penny, and Will is suddenly standing upright. See more »


Will Robinson: Are you out hunting for animals, Mr. Keeper?
The Keeper: In a manner of speaking, yes.
See more »


References The Day the Earth Stood Still (1951) See more »

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User Reviews

Two Part Block Buster
13 February 2015 | by See all my reviews

An alien known as The Keeper (Michael Rennie) wants to add Will and Penny to his collection of space creatures.

Over the decades I have spoken to many Lost In Space fans and I am yet to find someone who dis-likes this two-part adventure.

Wonderfully scripted, acted and filmed.

Jonathan Harris once said that Michael Rennie was without question the best guest star to appear on the series. I agree he is one of the best. Over the years I have seen Rennie in many roles but it is LIS's Keeper and Time Tunnel's Titanic Captain that I always remember him for.

This 100 minute Keeper adventure is close to perfect, with the whole regular cast getting things to do, the only small negative element is a two minute bit (in Part Two) where a very fake giant spider attacks the group.

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