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One day, zombies suddenly appeared on the streets of Hong Kong. Since those who were bitten would turn into zombies, the streets were soon overrun with them, and people were plunged into fear. One day, a zombie ran into the Hong Kong police station. As the police had no experience dealing with zombies, they were at a loss. At that moment, Officer Kam Kei (played by Andy Lau) and Shun Chiu (played by Stephen Chow) reasonably subdued the zombie. Their superior then ordered personnel to be drafted from various departments to form a Ghost Squad led by them. As a result, the Ghost Squad was formed by a motley crew of the least popular individuals from each department. Little did they know that as soon as training began, zombies invaded the Ghost Squad's training camp, and one of the trainees was bitten by a zombie without realizing it. He too began to slowly turn into a zombie...