Ready to visit the alternate universe, Fringe viewers?

On the first part of this show's two-hour season finale, Walter and Olivia are on a mission to prevent the collision of the two worlds... and the extinction of one.

Titled "Over There," the episode airs Thursday night and you can read more about it in our Fringe spoilers section. Below, we've published a series of photos from it:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.