Cpl. Dietrich: A Hospital Corpsman with Bravo Team, Dietrich is a fully trained Colonial Marine as well as a medic. When the team discovers a cocooned colonist on on LV-426, Dietrich attempts to save her, unaware of her condition.

Colonist Mary: A colonist at Hadley's Hope, Mary is infected by a facehugger xenomorph and cocooned to the wall in the colony's atmosphere processing plant. When the Marines find her, she is in the final stages of the infection.