During the filming of 'Alien: Romulus,' the actors had the unique experience of facing off against real creatures on set, thanks to the use of animatronic and puppet alien creatures under the direction of Fede Álvarez, a prominent horror filmmaker.
Actress Cailee Spaeny expressed how working with practical effects was a gift for the actors, as it allowed them to interact with the creatures directly, rather than having to imagine their presence.
