"I could atomize you! Or have bore worm maggots eat you from the inside out! Or push you through an airlock in high orbit and watch your blood boil in the vacuum!"
—Ming the Merciless, Flash Gordon: Zeitgeist
- 1988 series: Ming the Merciless is the depraved ruler of the planet Mongo who enacts the right of first night to rape any woman he desires. If the husbands resist, Ming is only too happy to murder them and wed the woman to their corpse before taking her. Ming attempts to break Dale Arden's mind to become his submissive woman, leaving Flash to melt in a death trap. Growing furious with Flash's resistance, Ming orders another ally to murder his own son and, when the man can't, Ming murders the boy himself to prove no wish of Ming's goes unfulfilled. Ming obliterates the entire city as a message, regularly starving, torturing and murdering his people and being willing to allow the destruction of another city and killing millions to preserve his rule. Fully willing to kill his own daughter if it benefits him, Ming is a sadistic tyrant who cares for nothing but his own power and pleasure.
- Zeitgeist & Merciless: The Rise of Ming prequel: This incarnation of Ming the Merciless may be one of the vilest yet. Ming the Merciless begins as the Prince of Mongo, and a ruthless schemer from the start to climbs his way to power by cutting off the wings of a rival and driving her to suicide while mercilessly murdering everyone else in his way, culminating when Ming uses a portable black hole to kill his own father. Ming comes into his own as a violent tyrant, once using his new siege projectors to suck an entire race out into vacuum to freeze to death. When Ming's lover is found to be cheating on him, Ming sets up her adulterous lover to be vaporized-along with three other planets. Ming continues slaughtering planets as a matter of course, while personally murdering minions and councilors alike for any reason he can think of and destroying the minds of women so they may be his concubines and attempting to force this process on Flash Gordon's beloved Dale. Ming masterminds World War II and Hitler's rise to power, using the Nazis to annihilate major cities while simultaneously pelting Germany with disasters so as not to let them get complacent. When Flash Gordon stands in his way for the final time, Ming merely opts to destroy Earth for the sole purpose of hurting him.
- The Dynamite-King incarnation of Ming the Merciless Appearances is the greatest evil in his 'verse. The tyrant ruler of Mongo and its colony worlds who seeks to use the mystical Gatestones to take over the universe, Ming has subjected countless billions to death, slavery or horrific experimentation, torturously augmenting millions of innocents into mindless Beast-Men to fill his armies. Ming is no less merciless toward his own men, regularly killing them for any reason he can think of. Ming debuts launching an EMP attack on Earth to black the planet out and cull the weak, before launching an attack on the weakened planet. Ming becomes steadfast enemies with Flash Gordon after, attempting time and time again to kill him and his friends, at one point ordering an entire city gassed simply to kill Flash. Ming culminates his villainy by having Coralia, an underwater planet, destroyed and its populace slaughtered, while capturing its queen Darya and torturing her into a broken shell of herself. Ming even takes out Darya's water-breathing organs and eats them, tormenting Dale Arden by mockingly asking her if she'd like a taste. Ming's final outing has him gassing cities on Earth to twist their residents into Beast-Men, subverting even his final Graceful Loser moment, simply to trick Flash Gordon.
- Serials: Emperor Ming the Merciless of Mongo is a cruel tyrant who intends to take Dale Arden as a forcible bride while trying to have the heroic Flash Gordon killed. Willing to let the entire Hawkmen people be wiped out, Ming also intends to destroy the world, returning after a seeming demise to ally with Queen Azura of Mars to destroy Earth again. Returning a final time, Ming poisons the Earth with a plague called the Purple Death to kill the human race.
- 1980 film: Ming the Merciless is the tyrannical emperor of planet Mongo. Every thousand years, Ming tests the life forms of the universe, terrorizing any planet he comes across with natural disasters. If he is recognized as responsible for these catastrophes, he deems the planet and its inhabitants a threat to his rule and destroys it. Setting his sights on terrorizing, and ultimately annihilating, Earth, Ming plagues the planet with natural disasters, causing mass chaos and destruction. The inhabitants of Mongo fare little better under his rule, as Ming is quick to kill them and destroy their kingdoms should they displease him. When Earthlings Flash Gordon, Dale Arden, and Dr. Hans Zarkov are brought before them, Ming lusts after Dale and attempts to force her to be his concubine, ordering Flash executed when he stands against him. He later attempts to brainwash Zarkov, all the while gloating about his plans to destroy Earth. His cruelty extends even to his own daughter, Aura; when he discovers that Aura has helped Flash escape his kingdom, Ming has no qualms with allowing his men to torture her to extract a confession. Upon locating Flash at Sky City, Ming has the kingdom obliterated, before attempting to force Dale to marry him, mentioning his plans to cast her off once he's grown weary of her.
- Flash Gordon (1979): Ming the Merciless is equally evil in both the original series and the TV Movie, The Greatest Adventure of All (which was actually created first, but not aired until 1982):
- 1979 series: Ming the Merciless is the warmongering lord of Planet Mongo, who rules over an iron-fisted regime of slavery and brutality. Ming habitually hosts gladiator-style tournaments of death and brainwashes women to become his concubines, the latter of which he attempts on Flash's beloved Dale Arden. Ming attempts to smash Mongo into Earth itself to conquer the latter, heedless of the horrible catastrophe that would ensue, and after he's thwarted, Ming continues on attempting to annihilate Arboria.
- The Greatest Adventure of All: Ming the Merciless, still a mass-murdering tyrant who cheerfully allows his slaves on Mongo to be eaten, provides aid and weaponry to Adolf Hitler on Earth during World War II. Ming attempts to wipe out the entire Earth, and in his attempt to kill Flash Gordon and his allies, utterly annihilates the sky city of the Voltan people.
- Defenders of the Earth: Prince Kro-Tan is the equally-horrible son of Ming The Merciless. Kro-Tan secretly hates his father and plans to overthrow him, leading him to get some magic powers. Kro-Tan manipulates the Defenders of the Earth into helping him activate a device that he uses to vaporize his father and then plans to let it kill the Defenders of the Earth. Kro-Tan tries to conquer Earth like his father before but eventually gives up and instead plans to launch a missile at Earth to completely destroy it. To reclaim dominance over his father, Kro-Tan enslaves several people in the mines on Mongo and forces them to work nonstop, not caring if they end up dying from the brutal labor. Kro-Tan does this so he can block out Earth's sun and cover it in an eternal winter.
- The Master of Mars: Pwami, the dictator of Mars and would-be dictator of the rest of the universe, rode his way into power on faulty campaign promises, letting the planet of Mars waste away into a drought shortly after he took over. Anyone who dissents is either subject to Pwami's death traps or trapped on the prison planet of Ceres, where prisoners are starved to death by the dozens. As fond of torturing people emotionally as he is physically, Pwami tries to force Flash Gordon's friends to watch as he is thrown to Pwami's death traps, then later tries to a captive Flash to pilot the very superweapon with which he intends to subject Earth, hoping to break Flash by forcing him to kill his own countrymen.
- Flash Gordon (1954)'s "The Witch of Neptune", "The Brain Machine", & "Struggle to the End": Zydereen, Mad Witch of Neptune, was the secret power behind the Neptunian throne before she was exiled. For revenge, Zydereen attempts to engineer Neptune's destruction by sabotaging the planet's atmospheric converter, condemning its population to suffocate. Not satisfied with having nearly destroyed her own people, Zydereen attempts to take over the entire galaxy, threatening to use solar rays to obliterate planets that don't fall in line. When she's foiled, Zydereen, out of spite, attempts to burn the entire galaxy and every living soul within it to ash with her solar ray machine.