During this run, Heck co-created characters including the supervillain and eventual hero the Swordsman, in #19 (Aug. 1965); the supervillain Power Man, who years later became the hero Atlas, in #21 (Oct. 1965); the cosmic entity the Collector in #28 (May 1966); the supporting character Bill Foster, who much later became the superhero Black Goliath, in #32 (Sept. 1966); and the supervillain the Living Laser in #34 (Nov. 1966). During the next comics era, the Bronze Age, he co-created another cosmic entity, Mantis, in issue #112 (May 1973).