VIDEO : Chris Pratt's Avengers: Infinity War Promise

Avengers: Infinity War star Chris Pratt says the Marvel blockbuster will live up to high expectations. Pratt tells HollywoodXYZ, "Shooting these films with the amount of cast members that are in it, the level of secrecy, and the lock and key under which the script was kept, the Russo brothers did an amazing job." Bringing together Marvel Studios' biggest franchises will make the Avengers threequel what Pratt called "the biggest movie of all time."