In Ridley Scott’s Alien, the xenomorph terrorizing the Nostromo was barely seen throughout the movie until the end. But that didn’t stop the filmmakers from carefully planning out the appearance and movements of the alien. They hired Bolaji Badejo to don the costume and create the body language of the creature.
Badejo was hired not only for his experience in Tai Chi and as a mime, but his incredibly tall and slender figure.
Test footage is online of Badejo practicing the xenomorph walk; while wearing an early version of the alien’s head.
Creepy? Why yes, yes it is. They certainly do not develop onscreen monsters like they used to.