Ultimately, it ends with a Thanos double-cross, and Star-Lord and a hero called Nova sacrifice themselves to trap Thanos in the Cancerverse.
I think it’d be awesome to see the MCU adapt that ending, subbing in the Quantum Realm, which is rumored to play a role in Endgame.
Similar in concept to Thanos killing him, my theory is that the Avengers will trap Thanos in the Quantum Realm, and Cap and one other Avenger will stay behind to make sure he stays there.
This one is my own personal theory about what will happen, and though there’s like a 2% chance that it does, I think it’s cool enough to include.