Lost in Space (1965–1968)
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The Keeper: Part 1 

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.


Sobey Martin


Barney Slater, Irwin Allen (created by)




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

Plot Summary | Add Synopsis


Not Rated | See all certifications »




Release Date:

12 January 1966 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:

Mono (RCA Sound Recording)

Aspect Ratio:

1.33 : 1
See full technical specs »

Did You Know?


The name of the electronic noise that is made when the Jupiter 2 lifts off is call a Shepard-Risset Glissando rising, or Shepard tone. See more »


Despite the one in "The Derelict" having been far larger, Will exclaims (upon seeing the Keeper's spacecraft) "It's the biggest spaceship I've ever seen!" See more »


Dr. Zachary Smith: I want to talk to you, sir.
The Keeper: What could you say that would be of interest to me?
Dr. Zachary Smith: How would you like to add some new animals to your collection?
The Keeper: Are you referring to members of the Robinson party?
Dr. Zachary Smith: Certainly not, sir. I assure you they are a very poor selection indeed. But it's an entirely different story on Earth. The planet literally swarms with all sorts of strange creatures.
The Keeper: [wearied] Yes, I'm beginning to realize that.
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 StuOzSee 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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