Tag it “Stan!”
PS: from wikipedia:
The first superheroes Lee and artist Jack Kirby created together were the Fantastic Four, based on a previous Kirby superhero team, Challengers of the Unknown, published by DC Comics. The team’s immediate popularity led Lee and Marvel’s illustrators to produce a cavalcade of new titles. Again working with Kirby, Lee co-created the Hulk, Thor, Iron Man, and the X-Men; with Bill Everett, Daredevil; and with Steve Ditko, Doctor Strange and Marvel’s most successful character, Spider-Man, all of whom lived in a thoroughly shared universe. Lee and Kirby gathered several of their newly created characters together into the team title The Avengers and would revive characters from the 1940s such as the Sub-Mariner and Captain America. Years later, Kirby and Lee would contest who deserved credit for creating The Fantastic Four.