CharacterJustice Society of America (Hawkman (Carter Hall), Professor Michels (of Gother University), Dr. Mid-Nite, The Atom, Alan Scott, Jameson (Albrook's butler), The Alchemist (Professor Zabor Zodiac) (villain), Black Canary, The Flash (Jay Garrick)), Black Canary (Dinah Drake), Dinah Drake, unnamed judge, The Alchemist (Professor Zabor Zodiac) (villain, death), Doctor Mid-Nite [Doctor Charles McNider], Justice Society of America (Green Lantern (Alan Scott), Justice Society of America (Black Canary (Dinah Drake), Professor Zabor Zodiac (villain, scientist, narrator), Wonder Woman (Diana Prince), Horace Albrook (millionaire, death), The Flash (Jay Garrick), Charles McNider, also as an unnamed contest judge) (villain), Green Lantern (Alan Scott), The Alchemist (Professor Zabor Zodiac, Al Pratt, Johnny Peril, Jay Garrick, Atom (Al Pratt), Jimmy (top-spinning contestant), The Alchemist (Zobar Zodiac), Princess Diana, unnamed prosecuting attorney, Flash (Jay Garrick), Zodiac's Alchemy Army (villains), Christopher Columbus (mention only), Green Lantern (Alan Scott)), Hawkman (Carter Hall)), Galio (scholar, includes flashback, death), Green Lantern
Superhero TeamJustice Society of America