To showcase his incredibly agile new star Cheng Tien-chi, veteran, venerated martial arts movie director Chang Cheh made this spectacular, internationally popular, favorite. Evil ninjas (who attack with, and from, fire, sun, wood, water, and the ground) brutally slaughter a noble Chinese kung-fu school's students. The one survivor finds a teacher and four students who are ninjitsu experts. The five graduates take revenge. With this strong structure and exceptional kung-fu choreography (from the star and co-star Chu Ke), Chang Cheh created one of his very best entertainments.