Kirby's co-plot credit is widely acknowledged by Lee and Kirby in numerous interviews. Credit here reads: "Welcome to the grandeur that is Marvel, produced proudly by: Stan (The Man) Lee and Jack (King) Kirby."
Letters from John Dodd, Lamar Mauldin, Mark Cordisio, Donald McGregor, George Ferguson, S. L. Cox, Bill Lewis, Cutler Ross Jr., Sgt. Michael Kuhne.