A fictional alien species, known unofficially as Death Angels or Happy, are the primary antagonists of the A Quiet Place horror media franchise.

[3][4] Additionally, the creatures are referred to as "Happy" internally by Malcolm Humphreys and the Industrial Light & Magic visual effects team working on the franchise;[5] the nickname was chosen as an ironic contrast to their viciousness in the films.

[6] John Krasinski, the director and co-writer of A Quiet Place, stated that the aliens in the film were designed to evoke an invasive species.

He also stated that they were partially inspired by the film RocknRolla, in which a story is told about invasive American crawfish in the River Thames that have eaten the native fauna.

Additionally, the Death Angels can be incapacitated and even killed by shrill noises, which send them into spasms that expose the weak flesh underneath their armor.

[16] The Death Angels feature as the enemies in the 2024 video game A Quiet Place: The Road Ahead, set between Day One and the first film.

[17] The Death Angels have been visually compared to various other creatures from science fiction and horror media, including the Demogorgon from Stranger Things, the alien bugs from Starship Troopers,[18] Clover from Cloverfield,[10] and the future predator from Primeval.