They showcased some serious ambition right away, arriving on Earth with the intention of taking over the planet, but before you can reach the back cover Reed Richards figures out a brilliant way to stop them (in short, it involves convinces them the invaders to live out their lives as cows).
The Skrulls are a perfect example of this, showing up in just the second issue of the Stan Lee and Jack Kirby series in 1962.
Because the Fantastic Four was one of Marvel Comics’ first forays into superhero and cosmic stories, many of the great original villains were introduced in the pages of those books.