An evil spirit possesses John Robinson and plans to fly the Jupiter 2 back to his home world, even at the expense of Will's life.



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


Professor Robinson, after being trapped in a cave overnight, comes under the spell of an alien entity. The alien, desperate to leave the planet, guides the professor through the repair process, but others, seeing the change in personality, question the mental health of John Robinson. Will they manage to save the professor's humanity, or will the alien personality be successful at killing all those who threaten his plan? Written by glen_chapman / edited by statmanjeff

Plot Summary | Plot Synopsis





Release Date:

27 April 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?


This episode exists with two different cliffhangers at the end. One is in black and white and is the segue for Lost in Space: Attack of the Monster Plants (1965), which began the first season repeat cycle during the series' initial run on CBS. The other is in color and is the segue for Lost in Space: Blast Off Into Space (1966), the first episode of the second season, which is in color. In syndication, the black and white version was used for many years, even though "Blast" usually followed "Follow" in repeat airings on local stations. The color version is used in the DVD release and during current (2013) airings on MeTV. See more »


When the alien Canto approaches the Jupiter 2, the robot alerts Will that he is coming. As Canto walks toward them, his shadow can be seen on the artificial background scenery. See more »


Canto of Quasti: Go, but remember - I am now a part of you.
Prof. John Robinson: No. I won't let you.
Canto of Quasti: There is nothing you can do, and every time you sleep I will gain further control of your mind. You are not to remember anything that has happened here. Now, go, and take good care of our body.
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User Reviews

Season One Ends With A Winner
15 February 2015 | by See all my reviews

An alien spirit, Canto, possesses John Robinson.

When seen in my 1970s childhood this episode scared the hell out of me. I don't have the same reaction as an adult today...but I still love Follow The Leader.

The voice artist for Canto - Gregory Morton - would have to be the most under-rated and under-used voice artist in Hollywood history!

I can think of many 1960s sci-fi TV hours that would of been given a lift if Morton was employed.

An so ends the 29 episode season one. The first 17 episodes were mostly outstanding, the ones that came after were mostly good, and just two stinkers (The Oasis, A Change Of Space) in the whole 29 episode run. Not bad at all.

3 of 4 people found this review helpful.  Was this review helpful to you?

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