'Avengers: Endgame' Closes In On 'Avatar' For Highest Box Office Gross

Comicbook.com reports 'Avengers: Endgame' may become the largest box office earner of all time. Iron Man actor Robert Downey Jr. took to his social media to encourage Marvel fans to go out to theaters. He wrote, "Get a new re-release on life and make #ENDGAME #1.... c’mon, there’s “new stuff” and everything..." Downey initiated the franchise in 2008 with hit film 'Iron Man.' The rerelease of 'Avengers: Endgame', which hits theaters this weekend, includes new footage and bonus features.