When a madman dubbed the "Scorpio Killer" terrorizes San Francisco, hard-boiled cop Harry Callahan -- famous for his take-no-prisoners approach to law enforcement -- is tasked with hunting down the psychopath. Harry eventually collars Scorpio in the process of rescuing a kidnap victim, only to see him walk on technicalities. Now, the maverick detective is determined to nail the maniac himself.
Dirty Harry Callahan returns again, this time saddled with a rookie female partner. Together, they must stop a terrorist group consisting of angry Vietnam veterans.
Philo takes part in a bare knuckle fight - as he does - to make some more money than he can earn from his car repair business. He decides to retire from fighting, but when the Mafia come along and arrange another fight, he is pushed into it. A motorcycle gang and an orangutan called Clyde all add to the 'fun'.