20th Century Fox

A lot has changed since the first "X-Men" movie was released in 2000, but there is one thing that ties nearly every entry in the series together: Mystique.

Whether played by Rebecca Romjin or Jennifer Lawrence (or any of the dozens of people she morphs into), Mystique remains a fan favorite, delivering some of the most badass moments of the franchise.

So, in anticipation of what will likely be a ton of awesome Mystique moments in "X-Men: Days of Future Past," we've found all 38 of Mystique's on-screen shape-shifts in the "X-Men" movies and put them all into one transformative mashup.

Who will she become next? You'll have to find out by seeing "X-Men: Days of Future Past," in theaters May 23.