In 1987, Italian Fabrizio De Angelis struck gold with what would be his longest running film series - KARATE WARRIOR!
De Angelis was a true hero during the golden age of Italian exploitation, producing many of Lucio Fulci's greatest works (Zombi 2, The Beyond, House By The Cemetery, New York Ripper, etc) and directing the Native American / Rambo knockoff classic Thunder (plus its two sequels). It seems he's had his fingers in just about everything - he was the special effects expert on Emanuelle and the Last Cannibals (1977) and the CHEF for Cold Mountain !
Karate Warrior followed hot on the heels of Karate Kid 2 (1986), presenting a very similar plotline but shifting the action from Japan to the Philippines. Young American Anthony Scott travels to Manila to visit his estranged father and quickly crosses paths with local thug/ martial arts master Quino. Kicking Quino in the balls (!!!) does Anthony little good to ingratiate himself to his new friend and is soon beaten & left for dead in the forest.... where a kindly monk / former ninja master nurses him back to health & teaches him how to kill a cow with the sacred & powerful Dragon Punch (a feat of magical skill - a blue halo of light engulfs the fist!) At some point, Anthony finds the time to fall in love, save the girl's brother from a house fire AND win her admiration by beating Quino in the town's karate tournament by using the aforementioned Dragon Punch (oops... spoiler alert). All in less than 90 minutes !