J'onn was a founding member of the Justice League. He was the only member who constantly lived in the Watchtower, however he frequented Earth. Upon the destruction of the first Watchtower after repelling the Thanagarian invasion, a new Watchtower was built which he later took residence in. After the Leagues significant expansion, J'onn took the role of the League's official coordinator, keeping watch on a global scale and handing out assignments based on the availability of hero personnel and the best match of abilities to situations However his solitude began to clearly manifest itself. In one instance, he had been in space for 2 years without going back to Earth. Supported by Wonder Woman and Green Arrow, he temporarily resigned his commission to mingle with the people of Earth. In this time, he met a woman and married her.

He eventually returned to active duty during Darkseid's second invasion of Earth.

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  • Vulnerability to Fire: Martians are much more vulnerable to fire than the average Earth human. At times this has been portrayed as physical, psychological, or a combination of the two. The effect of this is to strip any Martian of their powers as they involuntarily lose control of their body.[7]



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This character is or was a member of the Justice League of America, or the Justice League in any of its various incarnations, sworn by a duty to act as guardians of America and the world by using their skills and/or superpowers to protect Earth from both interstellar and domestic threats.
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