
In the Avengers post-credit scene, we see Thanos revealed as the mastermind behind the Chitauri invasion. If you pay close attention to this scene, there’s a hidden detail: a planet split in half in the background. This symbolizes Thanos' future plan to eliminate half of the universe's population, which was fully revealed in Avengers: Infinity War. Even though this movie came out in 2012, it subtly foreshadowed the Mad Titan’s devastating mission that changed the Marvel Cinematic Universe forever. Marvel is known for planting these kinds of secrets, and this one is no exception.