Boris was a mercenary and a member of Max Stafford's private military team. In 2004, Stafford's team was hired by Charles Bishop Weyland to accompany a Weyland Industries expedition to Bouvetøya, Antarctica. The expedition's objective was to investigate an ancient Pyramid buried beneath the ice there, with Stafford's team present to provide security. The Pyramid was discovered to be a Yautja temple and hunting ground where the Predators would breed Xenomorphs for use in their Hunts, and the expedition soon became caught up in the battle between the two species.
Boris was killed when the Predators raided the expedition's surface camp.
Boris was hired to provide security for the expedition to Bouvetøya, and was stationed at the team's base camp when a severe storm closed in. Amidst the blizzard, the men there were attacked and quickly slain by Scar, Celtic and Chopper; Boris died when one of the Predators burst into the hut in which he was sheltering, throwing him across the room and breaking his neck.