Marvel Studios has kept Avengers: Infinity War cloaked in secrecy, to the point that not even star Robert Downey Jr. knows how the film ends.

The first decade of the Marvel Cinematic Universe has worked toward Thanos' epic showdown against Earth's Mightiest Heroes, with Infinity War set to feature supersized ensemble. Since helping to kickstart the MCU in 2008 with Iron Man, Downey has become one of the franchise's biggest names. Yet, that doesn't mean he's let in on all of the secrets.

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Speaking with NDTV during a promotional event in Singapore for Infinity War, Downey played coy about Iron Man's chances of surviving the film. "Marvel hasn't even told me what the end of this movie is," he conceded, ensuring he won't be letting any big spoilers slip.

Of course, it may seem implausible that the star doesn't know how Infinity War will set up the rest of the MCU's Phase 3 and Avengers 4, especially considering Iron Man is expected to be a major part of the final scenes. However, executive producer Trinh Tran explained the level of security surrounding the movie's storyline, reiterating that the actors were given only their own parts, rather than a full script.

While it could just be a sleight of hand to stop the constant questioning, there is every chance that Downey really doesn't know how the third Avengers movie ends. Alongside the likes of Josh Brolin's Thanos, Stark will once again have a major part in Infinity War, continuing his relationship with Tom Holland's Spider-Man and forging new relationships with the likes of Doctor Strange, the Guardians of the Galaxy and Black Panther's Shuri.

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Either way, it sounds like Downey and the rest of the cast will be sitting down to view the movie in its entirety along with the rest of the world.  A lot of people have speculated that Iron Man will die before the credits roll, but it looks like everyone will have to wait a little longer to find out the truth.

Directed by Joe and Anthony Russo, Avengers: Infinity War stars Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Jeremy Renner, Scarlett Johansson, Anthony Mackie, Paul Rudd, Elizabeth Olsen, Tom Holland, Benedict Cumberbatch, Chadwick Boseman, Chris Pratt, Zoe Saldana, Dave Bautista, Bradley Cooper, Vin Diesel, Tom Hiddleston, and Josh Brolin. The film arrives April 27.