Get the colorized version on DVD, with a 2nd Audio commentary by Mike Nelson, of Mystery-Science Theater 3000. This is the best version available 0 it was released in 2004. They mess with the color in some scenes - changing it around for stoned watchers. It's also in the original Black and White, restored on the same disc.

I saw it many years ago, when NORML unearthed it from obscurity.