When Cadmus begins to discharge brand new Medusa virus so you can eliminate all the brand new aliens during the National Town, because a precaution J’onn commands Kara in which to stay the D.E.O. head office close to him and you will Mon-El. When they know the virus was out-of Krypton and you can is produced by Kara’s dad Zor-Este, J’onn tries to morale her because the she reminiscing off the girl lifestyle to your Krypton, admitting you to definitely her parents were not whom it looked. Abruptly, J’onn try hit because of the an enormous wave of aches, proving their oncoming White Martian mode and you will informed me exactly what had took place having M’gann’s bloodstream transfusion, believing there to get zero remove. Afterwards, J’onn and Supergirl left toward Federal Town port, where Cadmus wished to launch Medusa through heavens; whenever you are Kara ran pursuing the rocket toward virus J’onn grabbed into the Cyborg Superman changing totally into the a white martian but staying control over themselves.
When the virus was spread, J’onn ends attacking and you may get ready serenely to meet passing and you may rejoin their family members, however due to Lena Luthor’s betrayal facing the girl mom, the virus is made inert, and no chance to virtually any alien, together with frontrunner from Cadmus are eventually detained. After, by way of Eliza Danvers’ opposite systems out of an income decide to try out-of the virus, J’onn’s blood are drained from all of the Light Martian’s bloodstream cells, to their normal Eco-friendly Martian mode. 
Shortly after Kara and Mon-Este have been stuck on Maaldoria, J’onn, incapable of be involved in the help save objective, oversaw the operation regarding World, enjoy him or her both as they turned up straight back. 
Once M’gann sustained a telekinetic attack from the White Martians you to definitely remaining this lady into the a good catatonic condition and reach slow pass away, J’onn try unwilling about helping the girl due to his dated hatred on her type, but not, he chose to rescue her lives through the Martian Bond. J’onn ran towards this lady brain in which the guy discovered M’gann in the a good thoughts from the girl go out during the Galle Crater’s internment camp. M’gann told him that she try bought so you’re able to kill a green Martian boy however, she rejected turning on the shields alternatively and you may you to she pretended as a green to let J’onn feel less alone to try and atone for what she did. J’onn hoping the woman you to definitely she did not have feeling very accountable any more, the guy were able to eliminate the woman out-of the lady coma however, she informed him the White Martians would-be coming on her now. 
War for the Worldkillers
 The reason is that she discover M’yrnn J’onzz (J’onn’s father) arrested. Therefore Kara and you may J’onn went to Mars and you may was able to totally free Myrnn and you may aided M’gann plus the 
Shortly after helping beat the brand new Worldkillers and you may dropping their father after once again, J’onn chose to exit D.Age.O. and start to become a detective. 
From the People out-of Independence
Immediately after to-be a detective, J’onn befriended a female entitled Fiona Byrne,  that has been kidnapped and you will slain from the a hate class called Children regarding Versatility. Fiona’s fiance, Manchester Black colored up coming chose to simply take payback instead compassionate whom the guy damage on the way.  J’onn in the long run eliminated Manchester of the killing your making use of the Team off H’ronmeer. 
J’onn and you will Brainy observed Lois Lane in order to World-step 1 in order to confront John Deegan and you may An effective.Meters.An effective.Z.O. J’onn got they abreast of himself to safeguard civilians. Immediately following Brainy deactivated A beneficial.Yards.Good.Z.O and you will Oliver King outdone Deegan, J’onn, Kara, Brainy, Clark, and you can Lois gone back to Planet-38. 
Pursuing the defeat off Lex therefore the College students away from Versatility, J’onn and Superfriends was indeed entertained by win. J’onn discovered that a good prisoner he closed regarding Phantom Region entitled Midnight were able to eliminate. The guy localmilfselfies prijzen went to Kara’s pulitzer honor into the others. When Midnight assaulted, J’onn while the Very Nearest and dearest experienced this lady to transmit this lady right back towards Phantom Zone. J’onn was going to getting sucked towards the Phantom Area webpage, however, are protected because of the Kara. From the giving Midnight returning to his prison, J’onn discovered a person who claimed getting their sis.