1978 ALIEN screen test on the Nostromo set - Bolaji Badejo as the Alien. This was more or less a basic movement test, as the Alien suit was not yet finished. Bolaji had taken several movement classes for the role. In the end, less than half of the Alien's performance was actually Bolaji in the suit. Bolaji was chosen for his extremely slender and tall physique, which you can see clearly in this footage where he's only wearing briefs and a mock Alien head. | Giger's Alien

Noomi Rapace’s Prometheus screen test (with Rafe Spall as David) | Alien_Theory