Changes from the short story:
* In the episode, the Martian hallucinations in the asylum are simply colored lights reflecting what the insane Martians are describing. In the book, they are extensive projected hallucinations, which makes it seem more reasonable that the Martians would believe Williams' "delusions" were just that.
* A scene in the story of Williams interrogating a Martian child is removed.
* Many of the Martians in the story wear masks indicating their emotions. This is omitted from the episode. Oddly this is the opposite of what occurs in "And the Moon Be Still As Bright
," where a Martian mask is introduced into the episode that doesn't appear in the story.
* Xxx kills the Earthmen with a simple bullet-shooting gun in the story. The production crew decided to make the Martians more alien by having Xxx use a ray gun in the episode.