10 Times Comic Book Villains Became Heroes (In A Big Way)
10. Songbird
Songbird was originally introduced as the supervillain known as Screaming Mimi (okay.... I love the name) by Mark Gruenwald, Ralph Macchio and John Byrne in 1979's Marvel Two-in-One #54, before later switching to the Songbird identity in the 1990s.
Originally an antagonist who was a member of the evil wrestling-themed supervillain team known as the Grapplers, Screaming Mimi was subjected to a process by the Power Broker that enhanced her vocal chords, thus giving her the ability to project a deafening supersonic scream not unlike the one belonging to DC's Black Canary, albeit with a few other added perks.
Following her time with the Grapplers, Mimi rejected her old wrestling title and became known as Songbird, eventually linking up with Baron Helmut Zemo and joining his faux superhero team known as the Thunderbolts.
Unfortunately for Zemo, who had planned the Thunderbolts to be nothing more than a trojan horse for the Masters of Evil to exploit, Songbird and many of the other villains recruited for the team actually grew to love playing the hero. She and her teammates betrayed Zemo, and ultimately went on to lead the Thunderbolts in its later incarnations.