For the episodes of this serial, the story title, author credit and episode number were shown after the main title sequence and over a film montage of real volcanic eruptions. The transformed ...

In earlier versions of the story, Zaroff’s insanity was explained as the result of his grieving for the death of his family in a car accident. This was dropped from the final versions of the ...

Electrons moved in two dimensions when influenced by a magnetic field, hinting at how a similar effect would occur in the fourth dimension.