Nancy Lewis is a Cortexiphan test subject with the power of Pyrokinesis and the sister of Susan Pratt. After she was activated by Isaac Winters, she was kidnapped by Sanford Harris. Olivia Dunham managed to locate her and tried to free her but Harris locked Olivia in the containment room with Nancy. With Nancy about to spontaneously combust, Olivia managed to help her focus the energy onto Harris killing him. ("The Road Not Taken")