The Marvel universe is based loosely on the modern Earth, around the beginning of the twenty-first century. Superpowers are well-known, and while not common, there are a multitude of heroes who live on the Earth, frequently clashing with one another, and with supervillains bent on using their powers for more nefarious ends. Superheroes are generally very well-supported by the general public, and supervillains are largely unpopular with the masses. Most heroes are not aligned with world governments, instead forming quasi-organizations among themselves, such as the Avengers. These organizations tends to oppose the influence of supervillains, and operate autonomously with the help of the superheroes.