Another episode that used to scare the wits out of me when I was a kid! That crazy dimensional bridge really creeped me out. It seems LiS had a cosmic storm every other episode -- if they weren't finding stuff in caves, they were running from a cosmic storm!!! Kinda explains why John and Don were perpetually working on weather stations!Neat that Star Trek also had an anti-matter double fighting himself in the doorway between dimensions. I always wondered how the anti-matter villains had all this knowledge about OUR universe, but we're so in the dark!Also, if the anti-universe is the opposite of ours, shouldn't crime be legal? So why is anti-Robot caged, and why isn't the guard caged, too? Best not ask!

Or at least behind them. At about the 18 minute mark, shadows of the stage hands pushing the rocks around in the anti-matter world can be clearly seen particularly in the upper left corner of the screen. Also, where are anti-matter Maureen and the others? What would an anti-matter Dr Smith be like??? Robot over acting not withstanding, this was one of the best episodes of the series.

Shades of Star Trek!!! Much more plot than usual and interestingly presented. I agree with the other reviews except I like the Robot's brief encounter with his negative self. One Flaw: The usually spot-on Rob gives a hyterical, over-the-top performance. He's too loud!! But that's a minor flaw. Nice acting by Williams, in partifular, in a dual role.