Thanos Joined Avengers

Thanos, the antagonist, joins forces with the Avengers. Initially met with suspicion, his opposition to the Builders' values sparks an uneasy alliance. Despite doubts, Thanos' strategies and power shift the battle's momentum, forming both friendships and concerns among the Avengers. A confrontation between Thanos and Captain America exposes his plan to target his own son. The battle rages on the ship, and in a seemingly heroic sacrifice, Captain America falls.

In the aftermath, Thanos steps in to continue Captain America's legacy, offering his aid to the Avengers. Concealing his true role, the team allows Thanos to take Cap's place. An air of uncertainty lingers as they embrace this unexpected alliance, unsure of what the future holds.