Story: "Blood Kin" (21 Pages)

Credits:

John Ostrander (plot, script)
Tom Mandrake (pencils, inks)
Bill Oakley (letters)
Carla Feeny (colors)
Heroic Age (color separations)
Peter Tomasi (edits)

Feature Character:

Martian Manhunter (also in flashback in between JLA #15 and JLA Secret Files #2)

Guest Stars:

Superman
Batman
Wonder Woman (all three in flashback in following JLA #15)
Cameron Chase
Jemm, Son of Saturn (also in flashback)

Supporting Characters:

Karen Smith (deceased)
Lt. Segarini

Villains:

Ma'alefa'ak (also disguised as Wonder Woman)
The White Martians (in flashback preceding JLA #1)

Other Characters:

The Red Saturnians
The White Saturnians (both races only in flashback preceding flashback in Jemm: Son of Saturn #3)

Synopsis:

J'onn finds out about Karen Smith's murder, and begins his own investigation. The clues appear to point to someone very similar to himself, so he starts by investigating Jemm, a Saturnian who is recuperating at J'onn's Antarctic fortress. When he arrives there, he is attacked by Jemm who has memories of being brutally beaten by the Martian Manhunter. When Jemm is contained, J'onn calls in Wonder Woman to look after him, but unknown to J'onn, the Wonder Woman who arrives is in fact the same imposter that killed Karen Smith.