Full spoilers follow for Captain Marvel! When you’re done here, be sure to watch the newly released trailer for Avengers: Endgame, and also how many after credits scenes there are in Captain Marvel and the movie’s best Easter Eggs.
Everyone who’s seen Captain Marvel knows that Goose the cat not only steals his scenes in the movie, he also steals the Cosmic Cube. And that’s because he’s not just some mere tabby cat. No, it’s revealed that Goose is a Flerken, an alien species that just so happens to look exactly like earthly felines …. but with some very shocking and deadly differences.