Lost in Space (1965–1968)
3 user 1 critic

Attack of the Monster Plants 

Banished from camp for his latest endangering behavior, Dr. Smith discovers alien plants that can duplicate things (including people), which he uses to his advantage.


(as Justus Addiss)

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Episode cast overview:
Judy Robinson / Duplicate Judy
Will Robinson (as Billy Mumy)

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As the Robinsons accumulate the last amounts of fuel needed for lift off, Smith is expelled from the camp when his cowardice and sloth nearly costs the men's lives. John is undecided about taking Smith when they leave, but the doctor discovers that the peculiar reproductive habits of alien cyclamen plants might give him the upper hand. Written by Mister-UHF

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Release Date:

15 December 1965 (USA)  »

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:

(RCA Sound Recording)

Aspect Ratio:

1.33 : 1
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Did You Know?


Marta Kristen (Judy Robinson) has said that "Attack of the Monster Plants" was her favorite of the series. See more »


Though a stowaway aboard ship, Dr. Smith nonetheless has his own shaving kit and shaving lotion. See more »


Dr. Zachary Smith: Good heavens! They feed on deutronium!
See more »

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User Reviews

Judy's Hour To Shine
12 February 2015 | by See all my reviews

A double of Judy is created from a monster plant.

When seen in my 1970s childhood this hour was at times powerful drama and at times strong horror. The quicksand footage and the Judy swallowed by plant footage was heavy stuff when I was a kid. Sadly, the impact of this hour has softened to my now 40something mind.

Attack Of The Monster Plants is still enjoyed, but not as much as before.

Nice to see Judy get something to do for once, the poor girl spent so much of the series just standing around in the background. In season's two's A Visit To Hades she got more to do, but in one scene she cried like a child. Whatever the case, Attack Of The Monster Plants is Judy's hour to shine in Lost In Space.

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