Before they ever charged into the Octagon, our fighters had to make their way out of their cribs. Here's what a few of them looked like over the years.
In the sci-fi thriller Looper, a hitman gets sent back in time and comes face-to-face with a younger version of himself.
Looking at Bruce Willis and Joseph Gordon-Levitt (right), who play the older and younger versions of the assassin, we wondered how fighters would look if they time-traveled back to meet their younger selves. Some answers can be found in the photo gallery above.
