The enemy organization in the original "Double Dragon" are the Black Warriors gang, who are characterized as the dominant criminal organization in New York City after a nuclear war has left the city deprived of any law and order. Much like the Lee brothers themselves, the names of the gang members were established throughout the console versions of the series. The gang's original leader is the machine gun-toting Willy Mackey (commonly known simply as Willy), who wishes to acquire the knowledge of the Lee brothers' martial arts for himself and orders the kidnapping of Marian as ransom. Recurring members of the gang throughout the various versions of the first game include the thugs Williams and Rowper, dominatrix Linda, and bald strongman Abobo. The arcade version also featured two unnamed head swaps of other characters (namely of Abobo and the Lee brothers) as end-stage bosses: although these characters were absent in the NES version, which instead introduced a unique enemy, a Chinese martial artist named Chin Taimei. The Lee brother head swap would later appear in the Mark III/Master System version released by Sega, where he was named Jeff.