Avengers: Infinity War still. Picture courtesy/The Russo Brothers' Instagram account

Avengers: Infinity War directors Joe and Anthony Russo have penned a letter appealing fans to keep spoilers about the film to themselves. Addressed to 'the greatest fans in the world', the sibling filmmakers said they want everyone to experience the film without facing spoilers. "We're about to embark on the Avengers: Infinity War press tour. We will be visiting fans all over the world screening only a limited amount of selected footage from the film in order to avoid spoiling the story for future viewers," the duo wrote in a letter, posted on their Instagram account.