During production, American producer Henry G. Saperstein was highly impressed by Toho's giant octopus special effects from King Kong vs. Godzilla (1962). He requested an ending where Frankenstein fights an octopus. Director Ishirō Honda filmed the scene, but it was ultimately deemed too abrupt and omitted from the primary theatrical releases.
The audio track (Japanese with English subtitles vs. the Classic AIP English dub). The specific cut of the movie. Understanding the Different Versions You Might Encounter frankenstein conquers the world internet archive
