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- Icoids - former natives of Jupiter's moons, who later moved to the rings of Saturn. They and the Thermoids originated outside the Solar System.
- Imperiex Probes - The Imperiex Probes make up the body of a hive intelligence led by a cosmic being known as Imperiex.
- Imskians - Imsk is an ancient colony of Earth. The Imskians are humans who share the same metahuman talent, the ability to shrink. Shrinking Violet of the Legion of Super-Heroes is their representative.
- Invisible Raiders - The Invisible Raiders are a race of yellow skinned Saturnians with abilities similar to the Faceless Hunter.
Read more about this topic: List Of Alien Races In DC Comics