Tales of Suspense, Issue #39 (March 1963) introduced the superhero Iron Man, created by editor and plotter Lee, scripter Lieber, and artists Heck and Jack Kirby. He starred in generally 13-page but occasionally 18-page adventures, with the rest of Tales of Suspense devoted to the anthological science fiction and fantasy stories the comic normally ran.
After debuting with bulky gray armor, Iron Man was redesigned with similar but golden armor in his second story (issue #40, April 1963). The first iteration of the modern, sleek red-and-golden armor appeared in #48 (Dec. 1963), drawn by Ditko (though whether he or Kirby, singly or in collaboration, designed it, is uncertain). From #53-58 (May-Oct. 1964), the cover logo was “Tales of Suspense featuring The Power of Iron Man”. Two months before the debut of the sorcerer-hero Doctor Strange, Lee, Kirby and scripter Robert Bernstein, under the pseudonym “R. Berns”, introduced a same-name criminal scientist and Ph.D., Carl Strange. Making his sole appearance in the Iron Man story “The Stronghold of Dr. Strange” in Tales of Suspense #41 (May 1963), the character gained mental powers in a freak lightning strike. The Mandarin debuted in issue #50 (Feb. 1964) and would become one of Iron Man’s major enemies. The Black Widow first appeared in #52 (April 1964) and Hawkeye followed five issues later.