That's a pretty massive statement, especially considering the threat in question is almost certainly Doctor Doom. A recently revealed LEGO set titled Epic Battle: Doomsday Showdown appears to spoil one of the movie's biggest action sequences. The set includes Thor, Reed Richards, Mystique, Magneto, Nightcrawler, and Doctor Doom facing off against a giant Sentinel. That lines up with footage shown in the Avengers: Doomsday Comic-Con trailer, which featured Doom raising an army of Sentinels. We'll find out just how important Shang-Chi's role really is when Avengers: Doomsday crashes into theaters on December 18.