The Avengers have faced off against a number of formidable villains over the years in the Marvel Cinematic Universe, but all the individual movies lead up to a battle with an overarching villain when the heroes join forces in the Avengers movies. Thanos was the big bad leading up to the stunning double bill of Avengers: Infinity War and Avengers: Endgame, and the current villain in phase five is Kang the Conqueror, though questions remain around his future involvement in the MCU due to assault charges leveled against Jonathan Majors, who plays the complicated villain.