Martians are inhabitants of the planet Mars. The Martion civilization was almost wiped out in their war against the Chitauri, the only known survivors of their near-extinct race are the Martian Manhunter and Miss Martian.
While the term "Martian" was originally given to them by Astronamers, their actual name is Mar'u'ni meaning "people".
Martians are stronger and more durable than humans, capable of shapeshifting, intangibility and flight, and are telepathic. Martians have two genders, and marriage and familial relationships are apparently similar to those of humans.
The Martians evolved on Mars that was once lush and verdant. Mars' climate was drastically changed into a harsher environment after the planet was struck by a asteroid, thus forcing the Martians to adapt to survive in their new environment.
The entire Martian population was threatened by the Chitauri invasion. Only J'onn J'onzz and his family, Xi'aa and K'imm, were the only survivors. J'onn J'onzz had believed that he was the last of his people and traveled to Earth in preventing the Chitauri from invading Mars' neighboring planet and eventually joining the Justice League, while unaware that his family survived in suspended animation. It wasn't until Xi'aa awakened and telepathically contacted her mate that brought J'onn, the League, Fantastic Four, and the X-Men to Mars in rescuing not only J'onn's family, but foiling the Chitauri from attacking Earth. Sadly, Xi'aa passed away from radiation sickness and leaving J'onn and K'imm as the last Martians.