D4區是由美國軍隊使用、以測試其最新的武器並保護人民的區域。五角大樓確保這種超祕密地區受保護平民的存在。儘管採取了所有的預防措施，但還是發生了嚴重意外事件。美國ZF必須迅速行動，決定派遣一個救援僱傭軍矯枉過正！由於時間緊迫，五角大樓前決定剷平D4區和該地區所有的人。 D4 follows a team of special ops mercenaries on a mission to rescue a kidnapped kid believed to be held in an abandoned government facility. Hired by the boy's mother, a wealthy doctor with high reaching influence, all seems to be an easy job. Bu...