Introduction of Kryptonite

In the early 1940s, Dorothy Woolfolk proposed the introduction of Kryptonite in the Superman series, a pivotal narrative development. At the time, superhero vulnerabilities were minimal, and her idea introduced a profound element that deepened the narrative complexity of Superman. Kryptonite became an essential part of Superman lore, embodying the character's singular vulnerability. This addition is considered one of Woolfolk's most significant achievements, demonstrating her creative foresight and influencing character development strategies in comics.