Maggie Gyllenhaal is “interested in monstressness.” Frankenstein’s monster and its appropriately eccentric creator, Mary Shelley, have captivated generations for over two centuries. From Boris Karloff’s seminal performance as Frankenstein’s monster in the 1931 Universal Pictures adaptation to Guillermo Del Toro’s stylistic 2025 retelling, filmmakers and actors across the ages have spun cinematic excellence out of …