For Your Height Only (1981)

aka: For Y'ur Height Only

Mr. Giant has kidnapped the brilliant Dr. Van Kohler and is planning to use the Doctor's invention, the N-bomb, to hold the world hostage. The only one who can foil Mr. Giant's evil scheme is Agent 00 (Weng Weng), a 3-foot-tall Filipino martial arts master, expert marksman, top-class romancer and all-around superspy.