10 Comics You Must Read Before Avengers: Endgame
5. Infinity War

The events of Avengers: Infinity War were largely based off of the Infinity Gauntlet storyline, so it is not the craziest notion to think that there may be some things from Infinity Gauntlet's popular continuation story in the comics, Infinity War, that trickle down into Avengers: Endgame.
Unfortunately stopping Thanos' attempt at wooing death wasn't the last struggle Earth's Mightiest Heroes would have with the infernal Infinity Gauntlet. In Infinity War, the gauntlet is wielded by a completely different adversary.
Adam Warlock, who was taken over by a new dark persona, possessed the golden glove of decimation and was now the new big bad threat in the Marvel cosmos. This caused the need for Thanos to team up with the Avengers to stop this greater evil.
Rumors surrounding the fourth Avengers film believe that a bigger threat than Thanos will appear and that may cause him to possibly have to fight alongside his one-time adversaries in the same vein as the Infinity War comic storyline. Warlock has only been teased in the Guardians of the Galaxy films and probably won't be in this one, but this is definitely one to check out before Endgame arrives in theaters.