Originally released with a running time of 112 minutes but several critics complained about the slow pacing so, in 1968, director Arch Oboler cut it to 91 minutes. Unfortunately, the edits were made directly to the original camera negative and the footage was discarded. It was thought to be lost until a personal copy of the original print belonging to Deborah Walley was located. The 2014 Kino Lorber blu-ray retains the original title & 3-D but is still the 91 minute edit of the film.
The first feature film shot in the Space-Vision 3-D system, which used a single=strip over/under image format resulting in a 2.35:1 widescreen 3-D image.
Will be an experiment in Season 13 of Mystery Science Theater 3000