A deleted scene from Avengers: Endgame might prove that a popular theory about the villain Thanos (Josh Brolin) has been true all along.
Avengers: Endgame ended with Tony Stark snapping his fingers and wiping out Thanos and his army, much in the same way that Thanos wiped out half of the Avengers.
Either way, it’s probably nice for Marvel bosses to know that they can bring back Thanos should they ever want to.
If all those who were willed out of existence can return in the Marvel Cinematic Universe, then Thanos certainly can.