Its most well-known fictional supervillains are Lex Luthor, the Joker, Darkseid, Harley Quinn, General Zod, Catwoman, Brainiac, the Scarecrow, Doomsday, Bane, Parasite, Mr. Freeze, Metallo, the Penguin, Mongul, the Riddler, Anti-Monitor, the Enchantress, Two-Face, Steppenwolf, Mister Mxyzptlk, Clayface, Atlas, Killer Croc, Bizarro, Ra's al Ghul, Cyborg Superman, Poison Ivy, Ares, Mad Hatter, Maxwell Lord, Deathstroke, Doctor Poison, Deadshot, Circe, Black Mask, Star Sapphire, Professor Pyg, the Cheetah, Carmine Falcone, Sinestro, Red Hood, Black Manta, Killer Moth, the Reverse-Flash, Firefly, Captain Cold, Man-Bat, Heat Wave, Hugo Strange, Killer Frost, and Black Adam. 