The "alternate ending" that is reported as possibly filmed WAS as far as I can vouch for. I saw this as a child. Whether it was shown as an episode of Outer Limits, or just a special broadcast I don't know. When I saw this episode years later on syndication and got to the ending my first impression was "this is not how it ended!" There was no time machine,the time tilter did not work, and Andre was not dead. This was the version that I saw as a child, and I found out many years later that there were actually two endings filmed for this in anticipation of a series. It would be interesting to find out if there is a copy of the alternate ending episode. It did exist and was broadcast at least once as this was the version that I saw.