Stan Lee, author of the Avengers comic book, composed the team of Marvel's most prominent heroes. However, he eventually altered the team roster, removing all but Captain America, and added villains from other comics: the Scarlet Witch and Quicksilver from the X-Men, and Hawkeye from Iron Man's adventures in Tales of Suspense. The team was known as "Cap's Kooky Quartet".[8] Although common in later years, such a change in the roster of a superhero group was completely unprecedented.[9] Scarlet Witch would now become a lasting member of the team.