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White Martians are a hostile alien species found in DC comics who have acted as antagonists in several storylines - unlike the green-skinned Martians (such as Martian Manhunter/J'onn J'onzz) the White Martians are generally depicted as a dangerous and monstrous species who are opposed by the superheroes of DC universe.
In the Supergirl TV series, the White Martians are depicted as a fascistic, animalistic and genocidal race which conducted what amounted to a Martian version of the Holocaust as they all but wiped out J'onn J'onzz's race, the peaceful Green Martians, leaving only J'onn (disguised on Earth as Hank Henshaw, leader of the Department of Extranormal Operations) as his race's last survivor. In the episode "Strange Visitor from Another Planet", one such White Martian, disguised as anti-alien senator Miranda Crane, arrives on Earth and kills several DEO agents and residents of National City while searching for J'onn, but it is later stopped by J'onn and Supergirl. In the episode "Myriad", while Non sets out to release alien prisoners from the DEO as part of his Myriad project to enslave Earth and its people, he decides against releasing the White Martian, as he knows of its animalistic nature and its desire to kill anything it sees, which would have resulted in the deaths of many of the mind-controlled residents of National City had it been released.