?Black Panther? is expected to reach the $400 million mark on Sunday, posting an estimated $108 million on its second weekend. That gives it a new record for the best pre-summer second weekend in box office history, and beats the Marvel Cinematic Universe record for second weekends held by ?The Avengers? with $103 million. After just ten days in theaters, ?Black Panther? has surpassed the domestic runs of all of last year?s Marvel films, including the $389 million made by ?Guardians of the Galaxy Vol.