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
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.