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