Saw it many times as a kid This movie scarred the hell out of me back in 1953 (I was 9 years old at the time). However, I don't ever remember seeing the 3D version. In fact, the booklet that came with my new DVD said that the limited number of 3D cameras weren't available for use when IFM was originally made, due to a number of other 3D films being made at the same time. The negative was instead shot on the new single strip Eastman film.
Anyway, the movie was quite effective in creating a creepy and alien world in which a young boy could escape to on a Saturday afternoon. I enjoyed the story, and really didn't care about the mediocre special effects. In fact, because the story was obviously a dream, the soft focus shots and cheezy effects made it all the more surreal. I might also add that beautiful Helena Carter became my first dream babe! LOL.
Sorry Bruce Cook (an earlier reviewer), the actor who played David in IFM was named Jimmy Hunt.