10. Pepper Potts Kills Aldrich Killian (Iron Man 3)
Marvel StudiosWhen Tony Stark and James Rhodes were attempting to rescue the U.S. President and Pepper Potts from the abandoned tanker that Aldrich Killian had based himself on, it all seemed to go wrong. The room in which Potts was being held was rocked by an explosion caused by the fracas and, despite being within touching distance of Stark, Pepper plummeted to the bottom of the rig in to a fiery abyss and was presumed dead. However, it would soon be revealed that the Extremis procedure that Killian had conducted on her had kept her alive and she would end up saving Stark by killing Killian. And my word did she do it in an awesome way. Just when the villain was about to kill Stark, Pepper ambushed a passing Stark armour and ripped a missile and a repulsor from it using her Extremis-granted super-strength. She kicked the missiles towards Killian and, with perfect aim, fired the repulsor at it. The impact detonated the missile directly in front of killing, blasting him in to a million pieces and finishing him off for good in style.