We've told you all about the Raytheon Sarcos XOS exoskeleton, the smart suit of armor that endows its wearer with super-human strength. Now see it in action, and meet the minds behind both Iron Men—real, and imaginary.

Afghanistan. A hidden bunker. Four men with rifles guard a thick, rusted steel door. Bam! A huge fist pounds against it—from inside. Bam! More blows dent the steel. The hinges strain. The guards cower, inching backward. Whatever's trying to break out is big. And angry.