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:
Will Robinson (as Billy Mumy)
The Keeper


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)  »

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?


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 »


As he pursues the children fleeing from his spaceship, Mr. Rennie slows his pace to avoid catching up to them so Will has time to activate the door. See more »


Prof. John Robinson: Tell us about the cage.
The Robot: Special thermo-genetic unit adjusts to the biological need of each imprisoned animal.
Maj. Don West: What's the range of temperature?
The Robot: From 300° above zero to 150° below zero.
Prof. John Robinson: What sort of animals live at those temperatures?
Dr. Zachary Smith: I hope we never have the misfortune to find out.
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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