Diamondback (Rachel Leighton) is a fictional character appearing in American comic books published by Marvel Comics. Originally depicted as a supervillain who was part of the Serpent Society, she was first introduced in Captain America #310 (Oct. 1985) and became a series regular for years afterwards. Rachel Leighton made her debut as part of the Serpent Society and soon came into conflict with Captain America as the group carried out an assassination. Later on Leighton started to develop feelings for Captain America, drawing her away from the Society to the side of the good guys. After Captain America helped foil a takeover by Viper, the two began to date. Because of her involvement with a super hero the Serpent Society voted to execute her, but her life was spared by her friends within the Serpent Society. Leighton, along with Black Mamba and Asp, formed BAD Girls, Inc. a trio of adventurers who would on occasion aid Captain America. During the "Civil War" storyline BAD Girls, Inc. sided with Captain America's Anti-Registration group. She later became an agent of S.H.I.E.L.D., before briefly returning to her criminal roots as part of Serpent Solutions. Publication history Rachel Leighton first appeared in Captain America #310 (Oct. 1985), and was created by Mark Gruenwald and Paul Neary. Fictional character biography Rachel Leighton was born in Austin, Texas. She was once a part-time sales clerk at a boutique, but later became a mercenary. In Captain America #319, she reveals to Captain America that she has a brother and that when she was younger was introduced by him to the super-criminal known as the Trapster. In exchange for weaponry that the Trapster provides her with, Leighton suggests that in return she prostitutes herself to the criminal. One of the members of the original Serpent Society, Diamondback was a seductively sly woman with expertise in hand-to-hand combat, being trained by Anaconda at Taskmaster's academy. Her gimmick was that she threw acid-laced or poison-tipped diamonds at her enemies. After her first confrontation with Captain America while on assignment to find MODOK, she was instantly smitten. Diamondback was assigned to take Captain America into custody from the Porcupine, but was reluctant to attack, concentrating her efforts on Porcupine instead. She later attempted to form a partnership with Captain America to locate the Scourge of the Underworld. Viper staged a coup of the Serpent Society, causing several of her underlings to