SPOILERS AHEAD for Avengers: Endgame. The special features for the Home and Digital release of Avengers: Endgame have officially revealed that the MCU name for "Fat Thor" is actually Bro Thor. Following Thanos' Snap and the failure of the Avengers to initially undo the devastation caused by the Mad Titan, Thor finds himself in a deep depression and ends up letting himself go and becomes "Fat Thor," as he has been called. One particular special feature promises to go behind the scenes to see how Bro Thor was created.