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Watch Underworld online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

After spending seven years behind bars, Johnny Crown is back on the street, with lots of cash, a psychotherapy degree and a burning desire to find and punish gangsters who had killed his father. One of the people involved is Frank Gavillan, who unwillingly follows Johnny in his demoniacal and ultra violent crusade.