Female heroes have been a little hard to come by in the realm of comic-book movies, not just on Marvel's side of things but across all franchises. There is going to be a slight change in a couple of years, with Captain Marvel and Wonder Woman getting their own screen outings, but so far it has been Black Widow as the sole kick-ass female. She's more than held her own, but now she's going to face some competition. Emily van Camp's Agent 13, also known as Sharon 'niece-of-Peggy' Carter, is getting her role from The Winter Soldier beefed up considerably and will be taking Cap's side, while Black Widow - rather surprisingly - will be on Team Stark. It seems likely that these two top agents, neither of whom actually have superpowers, will be facing off during the film. You'd expect Widow to have a considerable advantage here, given she has fought alongside the rest of the Avengers for some time now, but Carter displayed her own fighting prowess in Captain America, and shouldn't be underestimated in this match-up. Who will win: Agent 13 certainly has the ability to give Black Widow a good fight, but Romanoff's been hanging out with the Avengers for the last few years. This one goes to her.