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The premiere of 'Avengers: Infinity War' has been held in Hollywood, giving the stars, press and some lucky fans an early look at what the biggest film in Marvel Cinematic Universe history has to offer.

Social media reactions indicate it's a big hit, but Marvel is asking fans to refrain from posting spoilers.

They even tweeted a 'no to spoilers' video featuring some of the biggest stars of the movie, and tagged it #ThanosDemandsYourSilence.

So why all the secrecy and hype?

(Photo: The official poster of 'Avengers: Infinity War' at the LA screening. Credit: Getty Images)