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Who are the main villains in the Avengers series?

Answer: The main villains in the Avengers series are:

Loki: Thor's adopted brother, who first appears in "Thor" (2011) and later in "The Avengers" (2012) as the main antagonist.

Thanos: The Mad Titan, who first appears in "The Avengers" (2012) as a minor villain and later appears as the main antagonist in "Avengers: Infinity War" (2018) and "Avengers: Endgame" (2019)

Ultron: a sentient robot, who first appears as the main antagonist in "Avengers: Age of Ultron" (2015)

HYDRA: a secret organization that is first introduced in "Captain America: The Winter Soldier" (2014) and continues to be a recurring villain throughout the series.

The Chitauri: A powerful alien race that serves as the main antagonists in "The Avengers" (2012)

Hela: The Asgardian goddess of death, who serves as the main antagonist in "Thor: Ragnarok" (2017)

The Red Skull: Captain America's arch-nemesis, who first appears in "Captain America: The First Avenger" (2011) and later in "Avengers: Infinity War" (2018).

Kang the Conqueror: time-traveler, who first appears as the main antagonist in Avengers: Endgame (2022)


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