Seven of Nine (born Annika Hansen) is a fictional character on Star Trek: Voyager, portrayed by actress Jeri Ryan. Born human, she was assimilated by the Borg at the age of six. Eighteen years later, Voyager leaves Borg space with Seven on board, after attempts to negotiate passage through Borg space prove only semi-successful. After The Doctor has removed the majority of her cybernetic implants, her human organs begin to reassert themselves, but Seven still requires a cortical node to control the remainder of her cybernetic implants. Although her link to the Collective has been severed, Seven of Nine still maintains the ability to sense nearby Borg activity.