While Lee intended to write the story himself, a minor deadline emergency eventually forced him to hand over the premiere issue to Lieber, who fleshed out the story. The art was split between Kirby and Heck. "He designed the costume," Heck said of Kirby, "because he was doing the cover. The covers were always done first. But I created the look of the characters, like Tony Stark and his secretary Pepper Potts. " In a 1990 interview, when asked if he had "a specific model for Tony Stark and the other characters?", Heck replied "No, I would be thinking more along the lines of some characters I like, which would be the same kind of characters that Alex Toth liked, which was an Errol Flynn type. " Iron Man first appeared in 13- to 18-page stories in Tales of Suspense, which featured anthology science fiction and supernatural stories. The character's original costume was a bulky gray armored suit, replaced by a golden version in the second story (issue #40, April 1963). It was redesigned as sleeker, red-and-golden armor in issue #48 (Dec. 1963) by that issue's interior artist, Steve Ditko, although Kirby drew it on the cover. As Heck recalled in 1985, "[T]he second costume, the red and yellow one, was designed by Steve Ditko. I found it easier than drawing that bulky old thing. The earlier design, the robot-looking one, was more Kirbyish. "