Ninja Operation - Knight and Warrior (1987)

After losing his wife and key witness to the ruthless drug lord and ninja assassin Rudolph, police officer Alvin is driven by a thirst for vengeance. His quest takes him to Hong Kong, where he allies with local detectives Gordon, Vivian, and Jackie to track down Rudolph. Unbeknownst to them, a young streetwise punk named Edmund is also on a mission—seeking revenge for his father's murder. As their paths converge, the tension escalates, leading to a thrilling confrontation with the enigmatic enemy who has intertwined their fates.