"The Ghosts of Mars" Parts 3 and 4 of 5. The original Justice League learns how to accept the Martian Manhunter as one of their own, but the most alien of the League comes with some baggage — in the form of his brother's ghost!
J'onn J'onzz is on Mars, is holding a conversation with his brother, Ma'alefa'ak. Though Malefic is dead, during their youth, J'onn and Ma'alefa'ak shared in the Martian rite of G'amal'khul, the exchange of self between loved ones. Centuries later, this aspect of self left behind in J'onn's psyche still persists. They discuss J'onn's relationship with the JLA and the people of Earth, arguing over his assimilation (or lack thereof) into their culture as well as the worth of Earth culture. It was revealed that Malefic has hidden the similar aspects of J'onn's wife and daughter, and now is manipulating J'onn in the real world to trick him into attacking the JLA.
In flashbacks we see J'onn teaming up with the Flash to defeat Weather Wizard, and in Malefic created illusions we see him in conflict with Aquaman and eventually the entire JLA.