Max Mitsopolis, or simply Max, is a major antagonist in the Mission: Impossible film series, being the overarching antagonist in the 1996 spy film Mission: Impossible and a posthumous antagonist in the 2018 action/thriller film Mission: Impossible - Fallout. She is an arms dealer who corrupted many IMF operatives to recover a list of infiltrators in Central Europe.
Max makes a deal with Jim Phelps : the list in exchange for money. Phelps accepts and kills members of his team. Ethan Hunt, who survives, learns of Max's existence and Job. He meets her and reveals that half of the list she received was false and included a tracking device. When the disc is tested, she realized Ethan was right. Max then makes a deal with Ethan: steal the genuine list in exchange for Job's money and identity. Ethan was also provided with $150,000, which he used to finance his new team. After Ethan retrieved the list, He finds Phelps and realizes that he was the mastermind behind the murders of his colleagues. A meeting was then organized in a TGV for Ethan to send the list to Max. Luther prevents Max from downloading the list. After Phelps and Franz Krieger are killed by Ethan, Max was found by Kittridge and the CIA, about to be arrested. She then manages to negotiate an agreement to remain free.
Max does not make an appearance in the film, but is mentioned by her daughter Alanna (a.k.a White Widow), who helps Ethan capture Solomon Lane in exchange for a plutonium sphere.
Max is considered by some fans to be the main antagonist of the film since she corrupted Jim Phelps and manipulated Ethan Hunt and Phelps himself. However, Phelps is the actual main antagonist because he lead the plot and served as a more dangerous and important threat to Ethan and his team.