I saw an old black and white space movie in 1968, where at the end the spacemen had to travel to an alien planet and re-start a giant clock which controlled universal time.
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1Interesting, but I'm not sure that's enough to go off, can you please check out How to ask a good story-ID question? to see if it helps jog your memory. – Möoz Mar 19 '18 at 2:07
There is a possibility that you saw The Wizard of Mars (1965). It was in color, but you might have seen it on a black and white TV. In the remote future year 1974, a spaceship crashes on Mars and the crew find a Martian city frozen in time and are given the task of restarting a clock to unfreeze the city.
http://www.imdb.com/title/tt0059920/1
https://en.wikipedia.org/wiki/The_Wizard_of_Mars2
https://www.google.com/search?q=the+wizard+of+mars+(1965)&newwindow=1&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjborWt6P3ZAhWluVkKHeoeAV8Q_AUIDCgD&biw=1920&bih=9493
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YESS! THIS WAS IT! I've been searching for this for YEARS! I did watch it on a B&W tv when I was 8 and my recollection of the details had changed over the years. THANK YOU SO MUCH! – heywoodgarth Mar 23 '18 at 10:50
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You're welcome. I couldn't begin to count all the movies and TV shows I assumed were in black and white because I first saw them on black and white TVs, only to later learn that they were in color. – M. A. Golding Mar 24 '18 at 7:18