J'onn J'onnz also known as Martian Manhunter is one of the tritagonists in CW's 2015 series Supergirl. He is the last Green Martian. Born and raised on the planet Mars, J'onn was thought to be the sole survivor of a "Martian Holocaust" instigated by the White Martians that also killed his entire family. J'onn fled to Earth and stayed hidden for centuries until he was discovered by D.E.O. Director Hank Henshaw. After Jeremiah Danvers seemingly sacrificed himself to save J'onn from being killed by Henshaw, the Martian began posing as Director to reform the D.E.O. for its intended purpose, recruiting Jeremiah's daughter, Alex Danvers, and later Kara Danvers/Supergirl.

After revealing his true identity, J'onn became an ally to Supergirl and her team, became the director of D.E.O (before promoting Alex to the director), and went by the name John Jones.

J'onn J'onnz is portayed by David Harewood.



Under the disguise of Hank Henshaw, J'onn appeared cold and calculating, believing that Kara using her powers would only add to the public unrest caused by her cousin's heroics.

However, after, he revealed his true identity to Alex and Kara respectively, J'onn is actually kind, caring, selfless, intelligent, has a sense of justice, honor and has good morals. He does also have a very sharp wit and has been proven to care for Alex and Kara as if they were his own daughters to the point when Clark accused him of not caring for Kara's well-being, J'onn lashed out, telling Clark to watch his mouth as he deeply cares about Kara; however, despite this, J'onn quickly back down when Clark threatened him, in an intimidating manner; proving that he is terrified of the kryptonian superhero and is unwilling to get into a confrontation with him.

Normally, J'onn is very calm, level-headed and patient, as he rarely loses his temper, however, he has no tolerance for those who disrespect his comrades. J'onn is also cold towards individuals that he dislikes for good reasons; like Sam Lane, due to the latter's arrogant, rude, ungrateful, selfish and immoral traits.

J'onn was initially very reluctant to use his powers, as he believes individuals will get hurt if he does use them. However, after his identity as the Martian Manhunter was revealed to the D.E.O., he gradually become more confident in his ability and alien heritage, as J'onn has starts to use his powers more frequently.

There is a dark side to J'onn's personality; as he can be cold, cruel, ruthless and vengeful, this is evidenced by the fact when he comes face-to-face with a White Martian, he would have killed the latter, if Kara and Alex had not convinced him to spare it's life. J'onn has a deep hatred for the White Martians due to the fact that they wiped out his entire race, and killed his entire family for no clear reason; simply to indulge their own warmongering desires. This made it hard for J'onn to accept that not all White Martians, like M'gann M'orzz are evil.

J'onn is cautious but simultaneously short-sighted, as he resolved to store Kryptonite in the D.E.O. as a contingency, to safeguard against potentially rogue Kryptonians, thus, leading to a falling out between him and Clark Kent, who believed that the Kryptonite the D.E.O. had could fall in the wrong hands, and would eventually be used against him or his cousin Kara, a fact J'onn did not consider. This fear of Clark's proved to be correct, though the situation was resolved when all the D.E.O.'s Kryptonite was entrusted to him.

Despite being an alien himself and wanting the planet Earth to be a safe place where humans and aliens alike can live in peace, J'onn is a hypocrite and has problems trusting other aliens, when president Olivia Marsdin was planning to initiate the alien amnesty act, a decree on granting aliens the rights of U.S. citizens, he was unsure about it, claiming that some aliens would take advantage of Olivia's goodwill; however, the latter put J'onn in his place, reminding him that the same thing was once said about him, when his identity as "Martian Manhunter" was revealed to the D.E.O., as J'onn was being hypocritical.

Powers and abilities


  • Green Martian physiology: Like all Green Martians, J'onn possesses several incredible powers. Overall, J'onn is one of the most powerful beings in the entire multiverse, with even Superman referring to him as the most powerful being on the face of Earth-38.
    • Accelerated healing factor: J'onn's martian physiology has moderate self-healing properties. This caused any wound inflicted on him to glow red and then vanish in minutes, which happened when he was shot with Hank Henshaw's special bullets. He was also able to heal himself soon after being stabbed by Indigo, though it took time for him to heal, suggesting that the greater the injury the longer he will take to regenerate from it.
      • Extended longevity: J'onn's life span is considerably longer than a normal human and likewise ages much slower. Despite being over 300 years old, his health, performance, and natural appearance has remained unchanged. He is also revealed to still be alive and an active-ally to the Legion in the 31st century.
    • Camouflage: J'onn can blend within the environment by changing the appearance of his form to bend the light waves around him to match with his surroundings making him almost - but not completely - invisible. He could possibly, also like his brother, turn into fly to become unnoticeable. He also used this ability to toy with Ben Lockwood in combat.
    • Density-shifting/Intangibility: As a Green Martian, J'onn is able to move through solid matter (such as walls and doors) or to increase his density to become near-invulnerable. He is able to use this offensively, allowing him to phase through people to cause internal damage or even pull organs out of the body, as he did to Metallo to remove his green Kryptonite infused heart. He can also phase his allies through walls, as he phased Supergirl and Winn Schott to Legion's ship below rocks or Supergirl, Mon-El, and Saturn Girl to L-corp to stop Reign. Also, he can phase with power magic staff like H'ronmeer's staff. He also managed to phase with Reign through ground with ease.
    • Invulnerability: J'onn's body is far denser than a human's, but not quite as durable as that of a Kryptonian, like Superman, while he is able to make himself more dense. While battling Manchester Black, J'onn was able to take multiple blasts from the latter's gun without any discomfort. He was also completely unaffected by a Black Hole with its void destruction. As a Green Martian, J'onn is also immune to all human diseases and illnesses.
    • Shapeshifting: J'onn is able to change his form at will, even on a cellular level, completely altering his physical appearance, allowing him to transform or mimic other people or animals and other creatures like Dinosaur or Fly. His abilities allowed him to appear with clothing and other wearable items when transformed and retain what he was wearing when in a specific form, such as his Martian Manhunter uniform or the sidearm he uses as Hank Henshaw. However, due to the fact that he was retaining his powers, he couldn't pass the biometrics scan locking mechanism that required Maxwell Lord's fingerprints in order to access through. Also, when posing as Kara, he had trouble walking due the high heel shoes he had in that form.
      • Malleability: J'onn can stretch and bend his body and limbs. (E.g. into large whips to grab things at great distance).
    • Super strength: J'onn possesses incredible superhuman strength, although not as strong as a fully-powered Kryptonian; such as Superman at the peak of his strength, though he can surpass a Kryptonian's strength using all of his powers (strength and telekinesis combined). He was able to quickly subdue a Red Kryptonite-infected Supergirl with ease using all of his powers, making him one of the strongest beings in the entire multiverse. Also, he could overwhelm Reign in terms of pure brute strength more easily than Kara. Even while not in his martian form, J'onn's strength enabled him to send Reign flying with one strike and he was capable of holding a pillar for an extended period of time in order to keep a building from collapsing. With just four of his punches, J'onn could break Kryptonian tech as he demonstrated when battling an individual who used Kryptonian body armor while imposing Manchester Black.
    • Super speed: J'onn is capable of moving at speeds that are similar to that of most Kryptonians. He can move at speeds that make him invisible to humans as he was able to instantly blitz multiple D.E.O. agents without any effort and save soldiers in China statuing 5th dimensional energy amplified by the Hat.
    • Telepathy: J'onn is able to read the minds of other people (except for Kryptonians) communicate with others mentally and projects his thoughts into others, as well as hear others people's conversation psychically. His telepathic powers are shown to be very potent, as he is able to overwhelm the minds of other powerful telepaths like one of Rhea's Bounty Hunters.
      • Mental detection: J'onn can feel and detect the mind of others, as well as their intentions, emotions and mental states. J'onn use this abilities multiple times, as when he sensed Alex Danvers' presence at the D.E.O, knowing Jemm was controlling the mind of the guard the and when he track and detect the location of the White Martian or Manchester Black. Also, combining with Nia Nal's astral projection, he could overwhelm telepathy disrupting 5th dimensional energy. He can use this to see with his mind like a mental view.
      • Mental shield: J'onn can telepathically shield himself and others from mental intrusions with enough effort, such as preventing other telepaths from scanning his mind. Doing this for Alex Danvers (shielding from Myriad) caused him some discomfort due to the effort and was unable to sustain it when he was wounded. But after a minute of resting could easily take Eliza Danvers from Midvale to National City shielding her also from Myriad.
      • Memory manipulation: J'onn can also search memories to obtain specific information, 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. He was able to induce amnesia to a Lord Technologies's guard. It was later shown that he could also wipe the whole Green Martians minds of his brother.
      • Mind control: J'onn can control the thoughts and actions of others (except for Kryptonians), implant words in other's mind. He with touch mindhaxed general Jim Harper's thoughts and his daily activity.
      • Psionic blasts: J'onn can project a powerful "mental blast" that can hit the target mentally or leave them unconscious. Like in Jeremiah Danvers rescuing mission or potentially like M'gann oneshoting groupd of several days yellow sun amped daxamites.
      • Psychic illusion: J'onn can project realistic illusions in other people's minds and make them experience things that does not actually happen.
      • Psychic translation: As a Green Martian, J'onn can psychically translate other languages.
      • Empathy: J'onn is able to manipulate and sense the emotions of others. Could also neutralize Fiona's physical lethal pain before her death. Could turn pain of all killed people by Manchester toward him even threatening he could kill him if he wanted to.
    • Telekinesis: J'onn can move and manipulate multiple objects with his mind. He can also generate telekinetic shield and shock-waves. J'onn was able to shove, grapple and pull Jemm without touching him and while being several feet away, as well as seemingly make a metal grate fall from the ceiling into Jemm's path to separate him from Alex several feet away.
      • Flight: J'onn can use the telekinesis to move himself, and simulate flight. When flying he is able to easily keep up with Supergirl, who can go over Mach 3.3 through intercontinental speed or 60% of light speed to speed of time travel + can keep up with the Flash (who was able to move at Mach 3.3 at the time then was much faster later + can casually tag Eobard Thawne who was even afraid of Overgirl) while teaching her proper flight tactics in battle, although he is notably slower than Superman, Supergirl and the Flash respectively at their top speeds. However, his flight speed was more than enough to catch Supergirl from falling to her death.
      • Shock-waves: J'onn is able to project waves of telekinetic force to hit, propel, crush or cut a target.
      • Telekinetic-shields: J'onn 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).
      • Opti-chroma kinesis: When in his natural form (as a Green Martian) J'onn's eye color is a rather bright shade of red. Because of this, his eyes glow this sanguine color whenever he has a burst of adrenaline in a different form, however, he can control his eye color as earlier on in the series (when he was an alien in secret) he would intentionally make his eyes glow red - however, whether he had irrational bursts of energy at those times is unknown. Consequently, there is enough evidence to prove that J'onn has the ability to manipulate his eye color.



  • According to Superman, J'onn is "the most powerful being on Earth".
    • However, J'onn has been beaten numerous times during major fights, particularly with the Worldkillers.
  • J'onn stated that he was 317 years old in late January 2016, making him currently 319 or 320 years old. According to Hank Henshaw, he has lived on Earth for over 50 years as of 2005. However, J'onn himself has claimed to have been on Earth for centuries, at least since the end of 1800s.
    • In episode "Wake Up," J'onn states that he has been on Earth for 300 years. This means that J'onn would have to be well over 377 years to have been married to M'yri'ah J'onzz for 77 years before her death and his escape to Earth. This means J'onn arrived on Earth in the early 1700s.
  • J'onn's size in his true Martian form is much greater to that of a human in his first appearance.
  • J'onn is one of the most wanted creatures to the eyes of the White Martians.
  • When transforming his body, phasing through objects, or even when being wounded, J'onn's body gives off a red aura.
  • J'onn was the one who came up with the name "Kryptonite".
  • His favorite food is Chocos, a DC Comics substitute for Oreos.
  • His favorite Christmas song is "Hall & Oates" "Jingle Bell Rock".
  • J'onn enjoys playing paintball with Alex.
  • J'onn loves the Star Wars films, especially The Empire Strikes Back, declaring it to be "the best movie sequel of all time".
  • After re-introduced his ship to help Malefic J'onzz travel back to Mars, Monitor admitted he was impressed by J'onn on Elseworlds, and he released Malefic from the Phantom Zone as a test. After J'onn passed the test, the Monitor then recruited him to aid in stopping the Crisis.
  • Winn's nickname for J'onn is Papa Bear as J'onn is the father figure to everyone on Team Superfriends, especially Winn, Alex and Kara given their negative experiences with their own fathers; Winslow Sr, and Jeremiah. In return, J'onn treats the team as if they were his own children.


           Arrowverse logo.png Heroes

Oliver Queen/Green Arrow | John Diggle | Felicity Smoak | Thea Queen | Laurel Lance (Earth-1) | Quentin Lance | Sara Lance | Nyssa al Ghul | Lyla Michaels | Curtis Holt | Rene Ramirez | Dinah Drake | Laurel Lance (Earth-2) | Roy Harper | Ray Palmer | Slade Wilson | Helena Bertinelli | Monitor

The Flash
Barry Allen/The Flash | Iris West-Allen | Cisco Ramon | Caitlin Snow | Joe West | Wally West | Jesse Chambers Wells | Harrison Wells (Earth Two) | Jay Garrick | Ralph Dibny | Kamilla Hwang | Barry Allen (Earth 90) | Monitor

Legends of Tomorrow
Sara Lance | Ray Palmer | Mick Rory | Leonard Snart | Rip Hunter | Jefferson Jackson | Martin Stein | John Constantine | Ava Sharpe | Gary Green | Nate Heywood | Zari Tarazi | Damien Darhk | Nora Darhk | Amanda Jiwe | Charlie

Kara Danvers/Supergirl | Alex Danvers | James Olsen | Winn Schott | Cat Grant | J'onn J'onnz | Lena Luthor | Clark Kent/Superman | Maggie Sawyer | Mon-El | M'gann M'orzz | Querl Dox | Nia Nal | Kelly Olsen | Monitor

Kate Kane/Batwoman | Luke Fox | Mary Hamilton | Jacob Kane | Sophie Moore | Julia Pennyworth | Monitor

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