M'gann M'orzz, also known as Megan Morse and Miss Martian, is a super-powered Martian antagonist turned ally in the continuation comics of Smallville Season 11, appearing in the "Effigy" issue.
M'gann is a White Martian born on Mars during a civil war between her species and the Green Martians. "The Martian Holocaust", as the war was called, resulted in the destruction of both species but to protect their child, M'gann's parents sent her to Earth in a spaceship. Her ship reached Earth but crash-landed in Colorado near Checkmate's Headquarters.
M'gann was discovered by some of the agency's agents where she was kept captive in the facility. She was kept for study and Dr. King Farady raised her as his own kin, due to seeing his own deceased daughter in the young Martian. When his real daughter died, M'gann took her form in an attempt to console him. They had grown close together despite their limited physical contact.
After Major Zod's attack to Checkmate, M'gann and Faraday were trapped inside the facility in the cell where the young Martian had lived since her arrival on Earth. The two stayed together for months locked inside the facility. Before dying, he recorded on his cellphone a message for whoever finds his corpse to take care of his daughter.
Faraday eventually passed away of natural causes. Abandoned and left alone in the darkness, M'gann lived in desperation and isolation alongside her surrogate's father's corpse. When Doctor Fate and John Jones encountered Icicle II, the magician restored the Martian Manhunter's powers sending a shockwave that was felt by M'gann who discovered he was a Green One.
In a fit of rage, M'gann freed herself from the prison and went on the trail of the Martian out of fear that he wants to eliminate the people of Earth like his race did to the White Martians.
Driven by a need for survival, M'gann went to Gotham City where she encountered a group of Mutants and killed them. While fighting in the sewer, Batman and Nightwing discovered M'gann in a dark long coat and hat. Before Barbara could react, the creature brutally slashes her. Batman arrives and quickly throws a flash bomb that stuns and frightens M'gann off.
Then she perceives the presence of the other Martian and assaults his home attacking its neighbors. A young boy went into Jones' apartment and finds a cloaked being in the apartment, holding the cracked Martian tablet. The boy asks where Jones is and the cloaked being attacks, revealing itself to be the White Martian.
Chasing the boy downstairs toward his mother, the Martian is nearly upon them when John intervenes. At the building's front door, Batman orders mother and child out for their safety. John fights with the White Martian. The creature identifies him by his Martian name, "J'onn J'onzz," and calls him a "murderer." As John unholsters his guns, the creature jumps on him and tries biting him.
John struggles as Batman tosses a flare near them and orders John to roll away from it. The flare goes off, scaring the White Martian. It crashes through a window and escapes into the city. M'gann later spied on Batman and Manhunter when they discovered her home and deceased father figure. She lurked in the shadows. At that moment, she leaps down from the shadows and attacks J'onn J'onzz.
Returning to the conflict between the two martians, Batman tells the White Martian to cease fighting as he knows her secret. He shows her the photo of Faraday's daughter and she manages to calm down and reveals her history telepathically to John Jones. During the battle, M'gann sets out the reasons for her behavior: the distrust of the other Martian and the fact that she attacked human beings only because she was afraid or felt them as "evil."
Shortly after, Batman threatens her with a firebomb and forces the young White Martian to tell her story to them. After she performs the request, the Hound of Mars, moved, realizes that everything that the young White Martian has known in her life is hate and, realizing that she is the only family left to him, decides to take her under his wing and make her his protege, a proposal that M'gann accepts with gratitude.
She joined the Teen Titans in San Francisco.