https://www.gamespot.com/articles/fortnite-josh-brolin-responds-to-dancing-thanos-i-/1100-6458915/

Thanos, the bad guy from Avengers: Infinity War, recently came to Fortnite as part of a limited-time game mode called Infinity Gauntlet. Now, the actor who plays Thanos--Josh Brolin--has responded to his character being in the game.

It sounds like Brolin had no involvement in the crossover, as he tells IGN, "I've been seeing this Fortnite thing everywhere; Fortnite, Thanos--and I had no idea what anybody was talking about."