Could Indiana Jones take the Terminator? Are Liam Neeson's particular set of skills any match for Sylvester Stallone's? Would Uma Thurman's samurai sword cut right through Robert Downey Jr.'s armor? And who really is the world's greatest spy: James Bond or Jason Bourne?

Well, you tell us. In honor of Sly Stallone and Arnold Schwarzenegger teaming up — and throwing down — in the upcoming "Escape Plan," we are unveiling the Action Movie Showdown, a bracket of 16 classic flicks. Cast your vote in head-to-head match ups between titles, and the top vote-getters will move on to the next round. Keep clicking on the icons to advance your favorites through four rounds of voting until one action movie reigns supreme as the greatest of all time.

In "Escape Plan," Stallone plays a prison expert who breaks out of jails to test for security flaws. But he gets betrayed and imprisoned in the most high-tech containment facility ever devised. So he has to team up with another dangerous inmate (Arnold Schwarzenegger) to have any chance at freedom.

"Escape Plan" busts out on October 18.

