Appearing in Superman: "The Three Super-Enemies!"
- Superman (Temporarily adopts the alias "Omni-Menace")
- Atlas (Earth-Three) (Single appearance)
- Hercules (Earth-Three) (Single appearance)
- Samson (Earth-Three) (Single appearance)
- Achilles (Mentioned only)
- Argus (Mentioned only)
- Jimmy Olsen Fan Club (Mentioned only)
- Jove (Mentioned only)
- A Kandorian scientist
- Legion of Super-Heroes (Mentioned only)
- Medusa (Mentioned only)
- Mercury (Mentioned only)
- Midas (Mentioned only)
- Morpheus (Mentioned only)
- Neptune (Mentioned only)
- Proteus (Mentioned only)
- Supergirl (Mentioned only)
- Thor (Mentioned only)
- Vulcan (Mentioned only)
- Earth-Three (Behind the scenes) (Unnamed)
- Superman Robots (Mentioned only)
Synopsis for Superman: "The Three Super-Enemies!"
Clark Kent summons Hercules, Samson, and Atlas to help save Metropolis in an emergency when he is otherwise occupied, but does not suspect that he has summoned the evil counterparts of these heroes from a parallel Earth.
Appearing in Supergirl: "The Man Who Broke Supergirl's Heart"
- Randor (Single appearance)
Synopsis for Supergirl: "The Man Who Broke Supergirl's Heart"
Lord Bronar and his henchmen Skoll, two villains who rule a planet of android slaves, scheme to steal Supergirl's powers and transfer them to Bronar. Their plot involves creating an android which is scientifically calculated to appeal to Linda Danvers, have him reveal that he knows Supergirl's double identity, and then have him pose as Randor, the "son" of Bronar, who wishes to marry her and make her princess of the world of Calyx. The plot works, and Supergirl is tricked into sitting on a throne that transfers her powers to Bronar. But Randor is ashamed of what he has done, and, incapacitating Bronar with Kryptonite, he forces them to switch chairs and transfer Supergirl's powers back to her body. Skoll destroys Randor, but Supergirl takes the two villains off for imprisonment, and declares to the android people of Calyx that they are free to
- "The Man Who Broke Supergirl's Heart" was reprinted in Showcase Presents: Supergirl Vol. 2.
- As revealed in Absolute Crisis on Infinite Earths, the Atlas, Hercules and Samson in this issue came from Earth-Three.
- No trivia.
- Discuss Action Comics Vol 1 320 on the forums
- Cover gallery for the Action Comics series
- Images from Action Comics Vol 1 320
- Superman Family Recommended Reading
- Action Comics (Volume 1)
- Adventure Comics (Volume 1)
- DC Comics Presents (Volume 1)
- Superboy (Volume 1)
- Superboy (Volume 2)
- Supergirl (Volume 1)
- Supergirl (Volume 2)
- Superman (Volume 1)
- Superman Family (Volume 1)
- Superman's Girl Friend, Lois Lane (Volume 1)
- Superman's Pal, Jimmy Olsen (Volume 1)
- World's Finest (Volume 1)
Links and References