Len Wein wrote the series from 1974 through 1978, working first with Herb Trimpe, then, as of issue #194 (December 1975), with Sal Buscema, who was the regular artist for ten years. Issues #180–181 (Oct.–Nov. 1974) introduced Wolverine as an antagonist, who would go on to become one of Marvel Comics' most popular characters. In 1977, Marvel launched a second title, "The Rampaging Hulk", a black-and-white comics magazine. This was originally conceived as a flashback series, set between the end of his original, short-lived solo title and the beginning of his feature in "Tales to Astonish". After nine issues, the magazine was retitled "The Hulk!" and printed in color.