After Sub-Zero became Grand Master of the Lin Kuei clan, he held a tournament in order to recruit strong warriors. The victor was Frost, whose exceptional skills impressed him. Breaking Lin Kuei tradition, Sub-Zero took her as his protegée and personally trained her. With his assistance, her ability to focus her freezing power increased. However, as her skills grew, so did her arrogance. As a result, Sub-Zero was unable to teach her humility.