Crimson Viper made her debut appearance in the 2008 Street Fighter IV as an American double agent posing as a S.I.N. worker but actually a CIA agent undercover. She wears a S.I.N form-fitting suit which enables her to perform electrical, seismic, and pyrotechnic moves. Her fighting style greatly revolves around baiting, fakes, high jump cancels, and rushdown. Because of this, she has one of the steepest learning curves in the game. It is said she is motivated by her daughter Lauren, as well as money. Crimson Viper also appears as a playable character in the crossover fighting games Marvel vs. Capcom 3: Fate of Two Worlds and Ultimate Marvel vs. Capcom 3.