10 Best Times Supervillains Switched Sides

4. Black Widow - The Avengers

As opposed to Rogue, whose criminal past has been somewhat forgotten in recent years, Black Widow's time as an enemy to the Avengers and as an agent of the USSR continues to inform the character in a pretty massive way. Most of her solo series' have drawn inspiration from her time as an assassin, and though the world has deemed her past crimes to be nothing but more water underneath the bridge - owing to the fact she's become a major asset for the Avengers and S.H.I.E.L.D. - there was a time where she even fought against Iron Man.

Natasha Romanoff first went to US soil in Tales of Suspense #52, and even recruits Hawkeye to fight alongside her. Though both would later become two of Earth's Mightiest Heroes, they each got up to their fair share of misdeeds, culminating in Romanova receiving her own high-tech costume before defecting to the United States officially.

The rest, as they say, is history. Clint Barton would become an Avenger, and so too would Romanoff. The latter would go on to star in a recurring role in Marvel's Daredevil, before adopting a greater synonymy with the Avengers and becoming an integral member of the team.