12 Biggest Unanswered Marvel Movie Mysteries
10. Black Widow's Red In Her Ledger
Black Widow's past is very much a hot, mostly mysterious topic in the MCU: we've seen flashes of it in her Age Of Ultron nightmare sequence, but so far very little has been mentioned of how she escaped the Widow programme and when she became affiliated with the "good guys".
All we know is that she has red in her ledger, and that she regrets some of her past actions, but we don't know what she is specifically referring to, or what Loki is when he taunts her with "Dreykov's daughter, Sao Paulo, the hospital fire..." in The Avengers. And without a retrospective solo movie, those answers - or how Barton knows all about them - aren't coming any time soon.
Surely it's time Marvel gave Natasha her own film to explore her past, her future and to show what really happened in Budapest? Now that she's gone rogue, it would be a great time to do it.