Thanos is coming to Fortnite for epic Avengers: Infinity War crossover The Mad Titan is coming for Fortnite. This isn’t one of those fun fan-made mashups for the YouTube crowd. Epic Games and Marvel have an unprecedented crossover event in the works, and EW can exclusively give away the deets! Thanos, the villain of Avengers: Infinity War, will drop into Fortnite‘s Battle Royale mode for a limited time starting Tuesday, May 8.