Aethyr is a godlike being whose outermost limit of the universe makes up the Phantom Zone. Anyone penetrating deeper into its realm finds that all things there are shaped-and exist or not-by Aethyr's whim. It is also known as "The Oversoul".
- DC Comics Presents #97 (1978) - "Phantom Zone - The Final Chapter"
- The Phantom Zone #3 and #4 (1982) - "The Terror Beyond Twilight!" and "The Phantom Planet!"
- Who's Who: The Definitive Directory of the DC Universe (1985)