The Martian Manhunter investigates Jemm as a possible lead to the killer of Karen Smith. This story tells the origin of the Red Saturnians (Jemm's race) and White Saturnians.

When J'onn discovers that his partner Karen Smith was killed by a hot ray at point blank range, he performs a psychic sweep across the globe to find the culprit. To his dismay, he is led to believe that Jemm, the Son of Saturn, is behind the murder. But when he goes to confront Jemm, J'onn uncovers a bit of disturbing news about himself...