As "Captain America: Civil War" revealed, Marvel's movies are getting bigger and bigger. And when you look ahead towards 2018's "Avengers: Infinity War," the casts aren't the only thing increasing in size. The film, which will see pretty much every one of Marvel's Earth-based heroes team-up with the Guardians of the Galaxy to fight Thanos, may just be the most expensive film ever made.

As reported by the Atlanta Business Chronicle, Chick-fil-A CEO and Pinewood Atlanta Studios co-owner Dan Cathy potentially revealed the budget for "Infinity War" and its 2019 sequel while at an African American Film Critics Association luncheon, where he was accepting AAFCA's Film Icon award for his contributions to the film and African-American community.

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"We now have on the lot down there now the largest film production ever with a $1 billion budget," Cathy said. No film was specifically named, but many assume this film is most likely "Avengers: Infinity War" and its sequel, which are currently filming back-to-back at Pinewood. If that is the case and the billion-dollar budget is shared between those two films roughly evenly, it would make "Avengers: Infinity War" and its sequel each the top two most expensive movies ever made.

The website The Numbers has a list of films ranked by production budget; "Avatar" is the most expensive movie ever made, with a budget of $425M. "Star Wars: The Force Awakens" follows with $306M, then "Pirates of the Caribbean: At World's End" and "Spectre" with $300M each. The Marvel movie with the highest budgets on the list are "Avengers: Age of Ultron" and "Captain America: Civil War," each of which cost $250M.

Opening May 4, 2018, “Avengers: Infinity War” features a sprawling ensemble cast that’s so far confirmed to include Robert Downey Jr., Mark Ruffalo, Chris Pratt, Jeremy Renner, Benedict Cumberbatch and Brie Larson, among others. The film will be followed by a fourth “Avengers” film on May 3, 2019.