Spider-Man: The Animated Series 4x6

Deborah Whitman has located Morbius, the Living Vampire, and brings him back to ESU to work on a cure. Just before leaving town, Felicia Hardy hears of this and uses the trip as an excuse to stay behind as the Black Cat. Together with Spider-Man and Whistler, she has to take on Herbert Landon and the Shocker in order to save Morbius from himself.