Sister Street Fighter (女必殺拳, Onna Hissatsu Ken, UK title: Revenge of the Dragon) is a spin-off of The Street Fighter (1974). The plot revolves around Lǐ Hóng-Lóng (李紅竜 Li Kōryū), the female martial artist of the title. When her brother Lǐ Wàn-Qīng is kidnapped by drug lords, she seeks revenge. The drug lord's colorful collection of "killers" includes a toga-clad group of Thai Boxers called the "Amazons Seven", along with representatives of almost every martial art.