Season 4 of Fortnite: Chapter 2 is officially here, and as usual, a lot has changed in the battle royale shooter. This season is themed around Marvel, and a ton of superheroes, from Thor to Iron Man and more, have made their debut in the game to stop an impending invasion by Galactus.While the arrival of Marvel's superheroes is the most prominent change in Fortnite, that's not the only thing that's different this season. In the video above, we break down the six biggest changes in Season 4. Be sure to give it a watch before you jump in and join the fight against Galactus.Of course, a new season also means new challenges, and this time you can unlock some exclusive Marvel cosmetics as you level up your battle pass. Check out our Fortnite Season 4 challenges roundup as the season rolls on for our latest maps and challenge guides.