'Avengers: Endgame' footage leaked, forcing fans to flee social media

Robert Downey Jr as Tony Stark in Avengers: Endgame

Leaked footage of Marvel's highly guarded Avengers: Endgame has prompted spoiler-averse fans to retreat from social media.

The long-awaited superhero film is due in cinemas April 26 and has already been breaking box-office pre-sale records. Disney has made painstaking efforts to obscure Endgame's content, but the leak undercut those efforts as spoiler-heavy footage made its way online this week.