The Martian Manhunter can alter his shape and appearance as desired; he is limited to human-like shape and proportions.
Martial Arts D * Strategy & Tactics
Leadership * Biology * Geology
The Justice League of America * The Denver Police Department
J'Onn J'Onzz, a leading citizen on his native world of Mars, was known for both expertise in science and as a military strategist. When a violent worldwide racial war broke out between J'Onn's green-skinned race and the white-skinned Desert Dwellers, J'Onn was placed in charge of the army.
While J'Onn wanted to harness the Blue Flame of Mars -- the planet's only source of fire -- for space exploration, the Desert Dweller leader, Commander Blanx, desired it for conquest. The battle was climaxed by a personal fight between J'Onn and Blanx, at the Blue Flame. The battle was sabotaged by Blanx, and so J'Onn was captured and the war ground to a halt. Rather than kill the popular leader, Blanx had J'Onn exiled to the desert for thirteen years.
During that first year, J'Onn was mysteriously teleported to Earth. It turned out that one Professor Erdel was trying to establish communications between the two world, and his experimental machine became a teleporter. Erdel died of shock from the sudden arrival of the opposing Martian figure.
Trapped on Earth, J'Onn used one of his natural talents to shape-shift his features so he could pass for a human. Altering his name to John Jones, he became a police detective in a small American city. J'Onn became a charter member of the Justice League of America when the aliens attempted an invasion.
Finally, J'Onn managed to reverse the teleporter and returned home to find the once-gleaming cities in ruins. It turned out that Blanx had managed to spread the Blue Flame throughout the planet, and it destroyed everything in its path. The few remaining Martians constructed a giant space ark to transport them to another world.
After defeating the threat of Blanx once and for all, the Martians, with J'Onn in the lead, traveled safely to another world now dubbed New Mars or Mars II.
Recently, J'Onn returned once again, but this time to warn Earth that Mars was preparing to invade the world.
With J'Onn and the JLA together again, Earth barely avoided an interplanetary conflict with J'Onn once more isolated from his people. In fact, during this time, the JLA regrouped and J'Onn chose to remain with the team -- forever exiling himself from his people.
Currently, J'Onn is with the JLA and is sharing an apartment in Prospect Park, Brooklyn, with teammate Steel. As John Jones, J'Onn is also a private investigator for Biloxi Investigations in Manhattan.