John Krasinski, direktören för A Quiet Place , diskuterade utlänningar i en 11 april Empire Film Podcast . En Colliderartikel transkriberade flera citat från Krasinski från podcasten, där han beskrev hur han bildade sin idé för utlänningar och hur de utvecklades:
"They are absolutely aliens. They’re from another planet. Where I developed the idea of them and what I wanted them to look like was most alien movies are about takeovers, agendas, they’re a thinking alien creature, and for me this idea of a predator, this idea of a parasite, this idea of something that is introduced into an ecosystem [was interesting]. One of my favorite movies I love to watch is RocknRolla and they tell that whole story about the crawfish in the Thames and that’s what I mean, the introduction of something that can’t be held back."
"I remember a terrible joke that I said was it would be—it’s disgusting and disturbing but it’s true—it would be like releasing wolves into a day care center. That’s how the world responds."
"The idea behind all that is they’re definitely aliens and they’re an evolutionarily perfect machine. So the idea is if they grew up on a planet that had no humans and no light then they don’t need eyes, they can only hunt by sound. They also develop a way to protect themselves from everything else so that’s why they’re bulletproof and all these things."
Han sa också att något orsakade en explosion på utlänningarnas hemvärld, vilket resulterade i meteoroider som bär utlänningar att resa genom rymd och krasch på jorden:
"And the other idea was [the armor is] also the reason why they were able to survive kind of the explosion of their planet and then survive on these meteorites, because they’ve evolved to be bulletproof. Until they open themselves up to be vulnerable, they’re completely invulnerable."