Sin (Sinthea Shmidt) is a supervillain appearing in American comic books published by Marvel Comics. The character is the daughter of the Red Skull and an enemy of Captain America. Publication history Sin first appeared in Captain America #290 (Feb 1984), and was created by J.M. DeMatteis and Paul Neary. Fictional character biography Seeking an heir, the Red Skull (Johann Shmidt) fathered a daughter with a washerwoman. After the woman died in childbirth, the Red Skull angrily almost killed the child due to being a girl. But follower Susan Scarbo convinced him not to, with the latter wanting to raise the girl herself as a nanny. The Red Skull agreed and left the girl, now named "Sinthea Schmidt", with Scarbo to be raised and indoctrinated with Red Skull's views as she grew up. The Red Skull returned when Sinthea was a child and put her in a machine that had her aged into adulthood and gave her superhuman powers. As Mother Superior, she was the leader of a group called the Sisters of Sin, young orphan girls who were accelerated into adulthood and given psionic powers by the Red Skull after being indoctrinated by Sinthea. The Sisters of Sin would have many run-ins with Captain America (Steve Rogers) before being de-aged when they entered a chamber designed to reverse the Red Skull's aging process and they were restored to children (she would later claim she was deaged to the wrong age - but whether this is true or not is unclear). Later, Mother Night reformed the Sisters of Sin as their new leader, while the de-aged Sinthea herself has used the name Sister Sin. Sometime later, she was captured by S.H.I.E.L.D. and taken to their reeducation facility, where they reprogrammed her with false memories as the "normal" American girl Erica Holstein. After the Red Skull was seemingly assassinated by the Winter Soldier under Aleksander Lukin's orders, Crossbones broke into the facility, kidnapped her and tortured her to break the reprogramming. After he succeeded, she simply called herself "Sin" while she entered into a relationship with Crossbones and the two went on a killing spree. She later reunited with the Red Skull who was now inside Lukin's body. As the first part of the Red Skull's master plan, Sin disguised herself as a nurse after the Civil War while Crossbones sniped Captain America at the courthouse, even though it meant obeying