Epic Games is teaming up with Marvel for an Avengers: Infinity War crossover in Fortnite: Battle Royale. Going along with Season 4’s movie theme, the villain of Marvel’s superhero blockbuster, Thanos, will make a surprise appearance in the free-to-play battle royale mode on PS4, Xbox One, PC, and iOS (via Entertainment Weekly).

The crossover takes the form of a limited-time event called the Infinity Gauntlet Mashup, which kicks off tomorrow, May 8. Like a typical game of Battle Royale, it pits 100 players against each other in a fight to be the last one standing, with one significant wrinkle: the Infinity Gauntlet will appear as a weapon.

During the match, the Infinity Gauntlet–equipped with all six Infinity Stones–will spawn somewhere on the map. The player who manages to find and equip it will transform into Thanos, which, according to EW, grants them “all the power that comes with him.” You can see an image of Thanos below.

The Infinity Gauntlet Mashup is the first special event of Season 4, which began last week with the release of Fortnite’s latest update. Epic hasn’t announced how long the mode will remain in rotation, but previous limited-time events have typically only been available for about a week.

Along with the start of a new season, last week’s update made some significant changes to Battle Royale. The mysterious comet that had been looming in the sky finally crashed over Dusty Depot, turning it into Dusty Divot. Epic also recently vaulted another weapon; this time, the crossbow was removed from the game.

With Season 4 now underway, Battle Royale players have a new set of skins and rewards to earn by completing new Battle Pass challenges. We’ve put together a guide on how to complete the first set of Season 4 challenges. Players who’ve completed those can also get a free Battle Pass Star.