Ever since 1979, moviegoers have been terrified by the nameless xenomorph introduced in Alien. And the success of that movie ensured that this franchise expanded even quicker than a chestburster ...

Arnold Schwarzenegger rejected a 20th Century Fox demand to add a love interest to Predator, a decision that helped preserve the sci-fi classic.

The best alien invasion movies feature the most exhilarating stories about extraterrestrial visitors, from War of the Worlds to Annihilation.