Somewhere in London, a fire-breathing dragon that had been sleeping underground for many years was awakened by the construction of an underground project and flew out of the cave. More than 40 years later, the dragon and its countless offspring occupied the earth, and human civilization was destroyed. Humans could only hide in the caves of abandoned castles and survive on crops that were not destroyed by the fire-breathing dragon. Quinn, the leader of the human race in the London area, was an orphan whose mother died in the dragon's flames when he was young. He led the only remaining humans in the area to fight against the dragon. One day, an American volunteer officer from another place, Van Sant, and his army came to help. At first, Quinn refused the support of the outsiders, but later realized that the Americans were also suffering from the destruction of the fire-breathing dragon. So the two armies combined their strength and planned to eliminate the first escaped dragon queen to fight for the survival and hope of mankind.