Sin

The daughter of the Red Skull, she was raised and trained from childhood to be her father's heir and continue his legacy of terror, shaped into a ruthless agent of evil through brutal conditioning rather than any superhuman gift.

Born from the darkest corners of Marvel's Captain America mythos, Sin made her chilling debut in Captain America #355 in 1989, brought to life by the legendary Mark Gruenwald alongside artists Rich Buckler and Al Milgrom. She's been a fixture of Steve Rogers' world ever since, sharing pages with the likes of Captain America, Red Skull, and Sharon Carter across a remarkable 36-year publishing history that stretches from the Copper Age all the way into the present day. With key collector issues to her name and a recurring presence across titles including Captain America: Reborn and the Modern Era Epic Collection, Sin is far more than a supporting player — she's a genuinely significant piece of Marvel's ongoing Captain America saga. If you're digging deep into that corner of the Marvel Universe, she's absolutely worth tracking down.