In the midst of World War II's final moments, a diabolical Nazi scientist named Klausener orchestrates a terrifying experiment, creating an army of immortal, zombie stormtroopers. As the war ends, his work remains a dark secret, but not for long. In the present day, a mysterious Nazi-hunter named Lena and a group of brave soldiers are sent on a perilous mission to uncover the truth behind the growing army of undead soldiers. They soon discover that Klausener's technology has been reactivated, and an unstoppable force of zombies is threatening to bring about the Fourth Reich. With the help of a brilliant but enigmatic historian named Wallace, Lena and her team must fight their way behind enemy lines and destroy the technology before it's too late. The battle-scarred team faces intense action, heart-stopping twists, and a desperate race against time to prevent the rise of an unstoppable new enemy in this gripping horror-thriller that will keep you on the edge of your seat.

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Some movies that have similar genres and were produced around the same time as Outpost: Black Sun include Shin Godzilla, Train to Busan, Parasyte: Part 1, Pandorum, Dead Mine, Empire of the Sharks.