Elsewhere during the 1960s, Heck penciled "The X-Men" #38–42 (Nov. 1967–March 1968) and introduced the new X-Men Lorna Dane in issue #49 (Oct. 1968) and Havok in #54 (March 1969). Heck drew, over John Romita layouts, "The Amazing Spider-Man" #57–64 and 66 (Feb.–Sept and Nov. 1968). Heck would also draw issues of "Captain Marvel" and "Iron Man", the World War II war comic "Captain Savage and his Battlefield Raiders", horror stories in "Chamber of Darkness" and "Tower of Shadows", and, once more, love stories, in the romance comics "Our Love Story" and 'My Love".