Before Agents Of S.H.I.E.L.D had Mockingbird, they had Agent Melinda May, arguably the most dangerous S.H.I.E.L.D operative around. She's director Coulson's right hand woman, a skilled (entirely human) fighter and a mistress of disguise. She (and the actress who plays her, Ming-Na Wen) alternates between frightening intensity and heartbreaking vulnerability and can play both notes to perfection. Any agent who earns herself the alias The Cavalry is bound to be a pretty high level warrior. Viewers have seen her take down scores of Hydra agents and do battle with Inhumans without seeming to break a sweat. And when a former S.H.I.E.L.D agent stole her face (long story), fans were treated to a May on May smackdown that featured some of the finest fight choreography in the MCU.