From his origins in Mary Shelley’s 1818 novel, through his many movie portrayals in the twentieth century, Frankenstein is one of the most recognizable characters in the world. His iconic look is a go-to Halloween costume for kids and adults alike. But how did the mad scientist and his creation become so popular? Author Sheila Keenan explains his spooky origin story, the history of the movies, and what lies ahead for this monstrous creature.