Based on the 70's cult classic Hanna Barbera animated TV series, a mild-mannered dog named Penry (Murphy) stumbles into a mystic ceremony and is accidentally granted mystic powers, including the ability to walk, talk, and do kung fu. Under the tutelage of his kung fu master, Penry dons a costume and becomes Hong Kong Phooey, and with the help of his trusting sidekick Spot the cat cleans up a rogues gallery of wacky criminals.