Most of the cast only received pages of the script that were related to their character, and reportedly only Benedict Cumberbatch read the entire thing.
That even extends to Robert Downey Jr., who has admitted to not knowing what happens at the end of the superhero epic.
Several stars of the movie have opened up about what it was like to be on the especially secretive set.
That doesn’t mean that people aren’t being as tight-lipped as possible, but it’s tough to spoil a movie when you, well, don’t know any spoilers.