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1960's sci fi movie about end of the world and scientists invent time travel and have to step through a window device

I remember seeing this on tv in the 1970's but I'm sure it was made in the 1960's. It was I think about the world was dying and scientists invent a time travel machine where you step through a window. I might be confusing the issue but I thing creatures from prehistoric times were involved in the movie. At the end of the movie the stars of film step through the time travel window. This one might he a bit difficult to name.
asked Apr 24, 2015 in Name That Movie by Mark of Australia (29 points)

1 Answer

Best answer
answered Apr 25, 2015 by casspir (19,116 points)
selected Apr 25, 2015 by Mark of Australia