Martian Manhunter Villains
B'rett B'urnzz – A White Martian criminal who escaped captivity by stowing away inside an experimental rocket that overshot its mark from mars and was hiding on Earth in Middletown, U.S.A., where he immediately went on a destructive rampage. He carries a Martian steel sword that can destroy most things it hits.
Ma’alefa’ak/Malefic – A devotee of Darkseid, Malefic created a plague that wiped out nearly all Martians. His twin brother J'onn opposed him and they thought each other dead after a pitched battle. Years later, Ma’alefa’ak found his brother to be alive on Earth and followed to vex him once more.
The Master Gardener – The Master Gardener and his shape shifting Lizard Man came to Earth from mars during World War II, and took advantage of the terror and confusion of the time to infiltrate governments and communications cartels. They grew plants bearing fungus that bonded to the human nervous system, allowing them to control the very words they spoke under threat of spontaneous combustion.
The Human Flame – A villain who wore a special suit that allowed him to project fire, which is the weakness of the Martian Manhunter. He was the first actual supervillain the Manhunter faced.
D'kay D'razz – An insane female Green Martian who was pulled to Earth by Dr. Erdel. Years later she came out of hiding to plague J'onn J'onzz. She was obsessed with starting a new Martian race with him, but was ultimately rebuked.
Bette Noir – A hideous genetically engineered monster with telepathic abilities and has the astral form of a beautiful woman. She is an enemy and sometimes ally of the J'onn J'onzz.
Cay'an – One of the few surviving green Martians who blames the destruction of her people on J'onn J'onzz for being too lenient on his insane brother Malefic. Cay'an also brainwashed a group of White Martians to attack the Martian Manhunter.