Dian Belmont Lawrence Belmont Thomas Schaeffer (last in issue #25) Ross O'Donald (next in issue #42) Helen (first appearance; Lawrence Belmont's secretary)
Villains:
Jonathan Smythe George Cohen (behind the scenes) Happy Weiss Bob (first appearance; dies)
Other Characters:
Fredric Baederstadt Charles Downs (dies) Miss. McKenna Brigadeer General Alexander Briggs Corporal Mitchell Robert Woods (a scientist of Acme Novelty Company) Arnold Weisel Wally Cornell (two independent scientists; first appearance of latter five) Lucky Lips Lugamo (a pilot; behind the scenes; dies)