Santana escapes his containment cell at the Nazi base, demonstrating terrifying biological abilities by contorting his body to move through air vents and even entering other people's bodies.
The "Ultimate Lifeform" antagonist with bone and rib-based attacks.
To finally defeat Santana, he must be exposed to sunlight. Major Rudol von Stroheim , trapped by Santana's grip, orders Joseph to hack off his leg with an axe so he can reach the sunlight outside. In a final act of nationalistic bravado, Stroheim blows himself up with a grenade to force Santana into the open.
The episode is noted for its high stakes and body horror, particularly Stroheim's demand to have his leg amputated to continue the fight.