Apocalypse: I Have a Super Fortress in Advance - Episode 6

Ray struggles to complete a crucial serum but needs a rare antibody found only in the blood of mutant zombies, who undergo a terrifying berserk mutation early in infection that makes them stronger and more aggressive. Despite the danger, Ray volunteers to hunt down one of these mutants to obtain a vial of its blood. Warned about the mutant's extreme strength and resilience, he prepares to face it alone and orders the blast door locked to protect others while he's gone. The episode ends with Ray spotting the massive, savage mutant he must kill to save his daughter, setting up a deadly confrontation.