A group of four low-level astronauts find themselves stranded on a space-based Sanitation Station after they unknowingly bring a strange device onto their vessel, leading to the disappearance of all life on Earth. Unbeknownst to them, they are about to face an assault from Gary, a rubber duck that has begun to mutate. Gary’s sinister plan involves opening a portal to his malevolent dimension with the aim of conquering the Universe.