Marvel has introduced some of the most dangerous villains in its universe, each with unique powers and terrifying ambitions. Thanos is perhaps the most infamous, known for wielding the Infinity Gauntlet and wiping out half the universe’s population. Cassandra Nova, a powerful telepath and the twin of Charles Xavier, is another formidable foe, known for her ruthless tactics against mutants. Other dangerous villains include Doctor Doom, Magneto, and Galactus, each bringing their unique brand of menace to the Marvel universe.