Concurrent with his move to Marvel, Colan also contributed several stories to Warren Publishing's line of black-and-white horror comics magazines, beginning with the six-page tale "To Pay the Piper", by writer Larry Ivie, in "Eerie" #2 (March 1966). There and in subsequent stories for that magazine and its sister publication, "Creepy", Colan would ink his own pencil work. His final original Warren story, "First Blood", appeared in "Eerie" #11 (Sept. 1967). The vast majority of these were written by Warren editor Archie Goodwin, with whom Colan would later collaborate on Marvel's Iron Man.