M'gann M'orzz

"We are monsters, Armek. This skin is beautiful."

- M'gann to Armek

M'gann M'orzz, is a White Martian from the planet Mars. Unlike most of her kind, M'gann didn't share the same hatred towards Green Martians, but was unwillingly recruited into the White Martian cause to wipe out their counterparts. After being unable to bare the slaughter, and a failed attempt to free several Green Martian captives, M'gann fled to Earth and remained in hiding for centuries. Hiding as an alien refuge, she took on the guise of a Green Martian, nicknamed "Miss Martian", to conceal her true nature. While disguised in human form she works as a bartender as "Megan", desiring only to live a peaceful life among humans. Eventually she encountered J'onn J'onzz/Martian Manhunter, the last of the Green Martians, and formed a steady friendship with him. M'gann and J'onn eventually fall in love with each other, however she ultimately decided to return to Mars to look for other peaceful White Martians like her.

Life on Mars
M'gann M'orzz was born and raised on the planet Mars. She hails from an underground warmonger race of psychic shape-shifters known as White Martians. Despite her mother wasn't an affectionate type, she always cared deeply for her. When M'gann reached adulthood, she had a combined marriage with a White Martian named Armek, which she regarded as the worst of their kind.

When her people invaded the surface of their world and wiped out the peaceful race of the Green Martians in the so called "Martian Holocaust", M'gann served as a prison guard in the Galle Crater's internment camp. However, unlike most of the other White Martians, M'gann had a sense of  justice, honor and good morals. She could not stand the slaughter of all those innocents at the hand of her kind, so after her's superiors ordered her to kill a Green Martian boy, she refused; instead she turned on the guards killing many of them in a fire after which she tried to free as many Greens she could and escape with them. However her attempt was thwarted by the other surviving guards, that came after her and managed to kill everyone but M'gann who, after having confronted and disfigured her husband Armek, escaped from her planet and sought refuge on Earth, where she hid for centuries.

Alien bartender and Fight Club
Eventually M'gann found a work at an alien bar in National City, where she took the form of a human woman and the alias of "Megan" to blend in. When Alex Danvers visited the bar to ask an alien for information about Scorcher, M'gann told her where the alien might be. When J'onn J'onzz came to the alien bar the following night, she was startled by his appearance. M'gann left suddenly telling him her shift ended; J'onn confronted her outside the bar where she took the form of a Green Martian claiming to be the last daughter of Mars.

She and J'onn talked about how she escaped from Mars and she came to Earth to seek refuge, anyway she altered her story telling him she was freed by a good willed female White Martian. Thereafter J'onn proposed her to establish a mental link to share consciousness, but M'gann refused.

After a few days Martian Manhunter finds out that M'gann, under the alias of "Miss Martian", is taking part to the battles in the alien fight club run by Roulette because of the need to expiate her guilt. When J'onn confront her about it, she claim it was her own business, J'onn replied that they should preserve what they have lost, but M'gann says that she wants to forget about everything. The next day J'onn came to the alien bar to apologize M'gann, but they are kidnapped by Roulette's guards and forced to fight to the death for the title of "last Green Martian". Despite M'gann's attacks, J'onn refuses to defend himself and told her that she should not become a murderer just because she feels guilty for having survived all their people. After hearing this, M'gann stops the fight and tells Roulette she will not kill him, so the ringmaster released Draaga to terminate them both but they are joined in the fight by Supergirl, who managed to defeat the enemy.

Later J'onn comes to M'gann's home again and said that it was right they leave the past behind. He also adds that if she does not want to establish a connection, he will not insist and that he'll always be there if she needs help. After J'onn left, however, M'gann looks at herself in the mirror mortified and assumes her real White Martian form.

Identity revealed
Over the next days M'gann and J'onn bonds and begin to know each other better. When Alex came into the bar asking M'gann for help as J'onn need a blood transfusion following his clash with Parasite. Although initially skeptical because her White Martian blood could poison him, M'gann agrees and saves his life. When J'onn wakes up, he sees M'gann sitting next to him, and thanks her for saving his life, asking her to stay with him until he falls asleep again.

Knowing that White Martian's blood transfusion turns Green Martians into white ones, M'gann visits J'onn to assure his wellbeing and even brings him a special martian recipe known as K'rkzar tonic. Though after J'onn checks his blood test results he deduces she's actually a White Martian and confronts her out of the alien bar. M'gann tries to explain she's not like the others of her kind but J'onn believes she is just a liar and begin fights her, beating her up almost to death. However, when M'gann assumes her human appearance begging him not to be killed in her real form, J'onn hesitate and instead decide to incarcerate her at the D.E.O. National City headquarters. M'gann was sitting in her cell when she started to suffer from a telekenetic attack from the White Martians that left her in a catatonic state. She was starting to slowly die and J'onn J'onzz was hesitant about helping her because of his old hatred for her kind, however, he decided to save her life through the Martian Bond. J'onn went into her mind where he found M'gann in a memory of her time at the Galle Crater's internment camp. She told him how she killed the other guards and that she pretended to be a Green in order to help J'onn feel less alone to try to atone for what she did. J'onn assured her that she didn't have to feel so guilty anymore, he managed to pull her out of her coma but she told him that the White Martians will be coming for her now.

Personality
Unlike most White Martians, M'gann is kind, caring, selfless, moral and honorable, she feels guilt and remorse for killing two White Martian prison guards, despite the fact that they were threaten the life of an innocent Green Martian child. M'gann is also intelligent, patient and calculating, as she managed to keep her identity as a White Martian a secret for 300 years while she was living on the planet Earth.

M'gann has no hatred towards the Green Martians, evidenced by the fact that when she cross paths with J'onn J'onzz, the last of his race, despite having the chance to kill him, she didn't and when she pretended to be a Green Martian to J'onn, it was not in a sadistic way but to make him feel less alone; as M'gann is disgusted by the actions her people committed against J'onn and his people.

M'gann also seem to despise her true appearance, describing her kind as "monsters"; when J'onn was about to kill her, she begged him to let her die in her human form rather than in her real one.

Powers

 * White Martian physiology: Like all White Martians, M'gann possesses several incredible powers, such as superhuman strength, near-impenetrable skin, telekinesis, telepathy, shape-shifting, intangibility, and even the power to defy gravity.
 * Longevity: M'gann's life span is considerably longer than a normal human and likewise ages much slower. As proved by being on Earth for centuries.
 * Super strength: M'gann is stronger than humans, as well as some aliens, though not as strong as a fully-powered Kryptonian. However she can augment her strength by focusing her telekinesis and using it in a tactile way.
 * Shapeshifting: M'gann is able to change her form at will, even on a cellular level, completely altering her physical appearance, allowing her to transform or mimic other people, animals or other creatures.
 * Malleability: M'gann can stretch and bend her body (E.g into large whips to grab things at greats distances).
 * Accelerated healing factor: Due to her shape-shifting powers, M'gann is able to heal faster than a human would.
 * Blood: If M'gann's blood is injected into a Green Martian's blood system, it will turn them into a White Martian.
 * Density-Shifting/Intangibility: M'gann is able to move through solid objects or to increase her density to become near-invulnerable.
 * Invulnerability: M'gann's body is far denser than a human's, but not quite as durable as that of a Kryptonian. As a white Martian M'gann is immune to human diseases and illness.
 * Camouflage: The ability to blend within the environment by changing the appearance of their form to bend the light waves around them to match with their surroundings, making themselves almost - but not completely invisible.
 * Telepathy: M'gann is able to read the minds of other people (except for Kryptonians), communicate with others mentally and projects her thoughts in to others, as well as hear others people's conversation psychically.
 * Brain blast: M'gann can project a powerful "Mental blast" than can hit the target mentally or leave them unconscious.
 * Psychic illusion: M'gann can project realistic illusions in other people's minds and make them experience things that not actually happen.
 * Mind control: M'gann can control the thoughts and actions of others (except for Kryptonians), implant words in other's mind, as well as to erase or restore and alter the memory of others, reprogram other people's minds and put others to sleep or temporarily paralyze others.
 * Mental detection: M'gann can feel and detect the mind of others, as well as their intentions, emotions and mental states.
 * Psychic translation: As a White Martian, M'gann can psychically translate other languages.
 * Mental Shield: M'gann can telepathically shield herself and others from mental intrusions with enough effort, such as preventing other telepaths from scanning her mind.
 * Telekinesis: M'gann can move and manipulate multiple objects with her mind.
 * Flight: By telekinetically moving herself, M'gann can simulate flight.
 * Shock-Waves: M'gann is able to project waves of telekinetic force to hit, propel, crush or cut a target.
 * Telekinetic-Shields: M'gann is able to generate a shield of telekinetic force for different purposes (such as to block or deflect incoming attacks, or to contain a target).

Abilities

 * Expert hand-to-hand combatant: M'gann is an expert in unarmed combat, enough to be undefeated in Roulette's fight club and stand head-to-head with J'onn J'onzz.
 * Multilingual: As a native Martian, M'gann speaks that language fluently, in addition to English.

Weaknesses

 * Fire: Like all Martians, extreme heat or fire can weaken M'gann and cause her pain. Also, while shape-shifting, any part of her body that comes close enough to touch fire partially transforms back into its true form, which could be used to expose her.
 * Maaldorian atmosphere: The air of Maaldoria contains a special sulfide which makes it toxic for M'gann.

Supergirl
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Behind the scenes

 * The show's version of the character is significantly different in physical appearance from her comic book counterpart. In the comics, M'gann has the appearance of a teenage individual rather than that of an adult. Moreover, in her human civilian identity (Megan Morse), she appears as a Caucasian, red-headed girl rather than an African-American woman. Her Martian form is also different on the show, as instead of resembling J'onn in appearance, she modifies her looks to that of a green-skinned humanoid-like individual with red hair.
 * In the comics, M'gann pretends to be the niece of Martian Manhunter.