It took nearly a decade for Stanley Kubrick's mind-blowing 2001: A Space Odyssey to air on U.S. network television, finally making its broadcast premiere on February 13th, 1977, on NBC's "Big Event." I remember it clearly, because I begged my folks to let me stay up and watch it (spaceships), but they only agreed to let me watch until my regular bedtime, as I had school the next day. On the east coast, it started at 8 PM, and my bedtime was nine (hey, I was only twelve!).
So... I only got to see the whole "dawn of man" sequence and maybe the PanAm shuttle docking with the space station before being hustled off to bed.
Now, at the tender age of twelve, I probably would have struggled mightily with the deliberate pace of the film and lack of action, but I was already a spaceship special effects junkie (thanks to Star Trek and Space: 1999), and was deeply disappointed that I didn't get to see more of the actual "space odyssey."
I didn't actually see the entire movie until I was at art school in '83 or '84, watching it in pan & scan on my tiny portable B&W television set. I didn't see it widescreen until it came out on DVD.