Back classic Nickelodeon days, they played a British Sci-Fi show
  called The Tomorrow People. I was like 10 years old, early
  1980s. I was haunted by this one scene in the show. The
  introduction started as it normally did, but on the VERY LAST
  NOTE of the theme, they replaced it with an explosion that i
  didn't expect. The people on this show didn't do Time Travel but
  here they did, and because of a mistake they made, there was an
  implosion of the time vortex and they had to "watch out for the
  vacuum!" and they were getting sucked towards the center of the
  implosion..
  After this point, history had change and when they returned to
  1970s England, the Roman Empire was *still* around, technology
  was thousands of years advanced, and all sorts of stuff. So,
  this explosion was the turning point and it just stuck with me
  for years and I wanted to see it again. So, I found it the other
  day on a search. I look at it now and it's the same cheesy
  special fx I remember; even at the first (an only) watching, I
  knew they were cheesy. But I didn't care because of the
  storyline, which was new to me at the time... this idea of not
  only changing history but introducing technology 2000 years ago
  that advanced human civilization (great!) but the Romans ran
  everything like Nazi Germany and it really wasn't a good thing.
  Anyway, I wanted to share. It's not something that would be
  meaningful to TOO many people out there: You'd have had to have
  been a kid at the time yourself *and* a watcher of the show to
  appreciate it fully. But it was nice to get this haunting image
  out of my head now that I've seen it again. Now that I've tied
  it together I can put it aside. :)
  https://www.youtube.com/watch?v=QKDs0GZMpjM