Thanos
Thanos is one of the most powerful aliens from the ‘Marvel World.’ Thanos is portrayed as a villain who wants to defeat the Avengers and save the universe by wiping out half of the population. It is difficult to defeat Thanos because of all the strength he had. If you’ve watched The Avengers: End Game, you’d know what happens to him at the end. Even though Thanos portrays many evil traits, he is still marveled by many fans of today’s generation.
So, you see, aliens are not that alienating. In fact, the way Hollywood has portrayed them in movies, it seems the humans on Earth wouldn’t be shocked if they saw aliens in real life.