| "Legion" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin.|
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- Legion (religion); The demon that, according to Biblical lore, was exorcised by Jesus of Nazareth.
- Legion (Castlevania); A giant floating ball of comprised corpses from the Castlevania series which is also based on the biblical demon Legion.
- Legion (DC); A supervillain from DC comics.
- Legion (Gamera) - A race of giant creatures and the titular main antagonist of the 1996 Kaiju film Gamera 2: Attack of Legion.
- Legion (Marvel); A tragic anti-hero from Marvel comics. That name would soon become that of the unholy transformation of the evil being Blackheart in the live-ation film Ghost Rider.
- Legion (Red Dwarf)- The creature composed by all people who are in his proximity.
- Legion (Shadow Man) ; The Dark Lord of Deadside and final boss of Shadow Man. Most of his character is derived from the biblical villain, and he is implied to be him.
- Legion (Wizard); ?.
- Legion of Darkness; ?.
- Legion of Doom; A group of DC supervillains and sworn enemies of the Justice League.
- Legion of Everblight; ?.
- Legion of Super-Villains; ?.
- Legion of the Third Eye; A militant and theocratic, utopian cult of alien fanatics ruled by Lord Despero and former villains in the Justice League cartoon series.
- Legion of the Unliving; ?.
- Caesar's Legion; The misogynistic, slave-driving Roman-wannabes looking to take over the Mojave Wasteland.