Late in the decade, with the pulp magazines in decline, Sprang gravitated toward comic-book illustration. With Norman Fallon and Ed Kressey, he co-founded the studio Fallon-Sprang at "a little studio loft on 42nd Street between Fifth Avenue and Grand Central" Terminal and with a contact address of 230 West 101st Street in Manhattan. A promotional flier advertises the studio as comics packagers for such "supermen" features as "Power Nelson" (introduced in "Prize Comics" #1, March 1940) and "Shock Gibson"; "human interest" features such as "Speed Martin"; and the "interplanetary" feature "Sky Wizard" and detective feature "K-7" (both introduced in Hillman Periodicals' "Miracle Comics" #1, Feb. 1940, and attributed to Emile Schurmacher).