In the wasteland, Steel City is mankind's last arsenal and bastion of hope, relying on weapons trade to maintain its existence. {Zhao Tieshan} As the captain of the Iron City Guard, he has been resisting the invasion of mutant beasts and predators all year round. Recently, the surrounding mutant beasts have suddenly become extremely ferocious, and under unified command, they have besieged the Steel City many times, putting the city's defense in danger. During a patrol, Zhao Tieshan captured a mutated beast and accidentally discovered that it contained an alien control chip - this was actually a conspiracy by alien forces to destroy the Steel City and cut off the supply of human weapons. In order to protect his homeland, Zhao Tieshan strengthened city defenses and trained soldiers while forming an elite team to go deep into the mutant beast's lair to explore alien strongholds. Deep in the lair, they faced the alien temporary base and terrorist guards, and fought to the death with the help of Steel City's advanced weapons. They eventually destroyed the controller and eliminated the threat of mutant beasts. After this battle, Zhao Tieshan became the legendary watchman of Steel City, and mankind finally knew that a more terrifying alien threat had arrived outside the wasteland.