By 1970, however, Marvel work became less frequent, and Heck obtained assignments from rival DC Comics, beginning with a short story in the supernatural anthology "House of Secrets" #85 (May 1970). He did his first DC superhero work with "The Flash" #198 (June 1970), illustrating a backup story of the super-speedster, and eventually garnered additional work including romance comics, and the backup features "Batgirl" and "Jason Bard" in "Detective Comics", and "Rose and the Thorn" in "Superman's Girl Friend, Lois Lane". He began a short run on "Wonder Woman" with issue #204 (Feb. 1973), in which the character's powers and traditional costume were restored after several years, and he also freelanced for the short-lived publisher Skywald Comics.