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JYvrv TIL DC Comic's Watchmen was originally intended to use existing heroes from a company DC had just purchased. DC liked the proposal for the Watchmen but didn't want their new characters killed or made into villains. The Watchmen creative team reworked the Charlton heroes into similar substitutes.
D1eGj TIL that The Hulk was inspired by a woman. Jack Kirby created the character after watching a woman lift a car off of her child, who was trapped underneath.