Pepper Potts
Pepper Potts resumes her activities as personal secretary of Tony Stark. When Pepper is caught in a terrorist explosion caused by Ezekiel "Zeke" Stane, she sustains multiple internal injuries, including shrapnel wounds, and rendered unable to withstand a prolonged surgery. In response, Tony embeds a strong magnet (similar in appearance to the arc reactor of the movie) in her chest, essentially turning Pepper into a cyborg dependent on keeping her chest magnet engaged to stay alive, as he was once.