US/Glickenhaus version

New York police officers Billy Wong and Michael are having a drink at a bar when armed crooks appear, looking for money. A fight ensues in which Michael dies and Wong kills all of the criminals. Wong is demoted to crowd control for the ruckus. Later, in the middle of a fashion show, masked gangsters storm in and kidnap Laura Shapiro, the daughter of known gangster Martin Shapiro. Crime boss Harold Ko and Martin Shapiro are suspected of smuggling drugs from Hong Kong to New York, and Ko may have taken her to Hong Kong for ransom. Wong and his new partner Danny Garoni get a lead – Shapiro's bodyguard Benny Garucci recently made several calls to a Hong Kong massage parlor.

Wong and Garoni go to the parlor. While investigating, they get massages, and the masseuses try to kill them. Billy and Garoni fight back and escape alive.

The next day, Wong and Garoni show Hing Lee the coin of Tin Ho, a Chinatown informant of Wong's and a friend of Lee's. Lee, concerned for his safety is reluctant to give any information about Harold Ko, noting that he retired. A man named Stan Jones gets on the boat, and warns Wong and Garoni they are being followed by the massage parlor manager and his men. Garoni, Jones and Wong get rid of the other gangsters and pursue the parlor manager to get more information, but fail to catch him. After witnessing this, Hing Lee agrees to help, telling the cops to come back the next day while he gathers information.

Wong and Garoni head back to their hotel, a suitcase full of cash on the bed. Harold Ko then calls them, telling them to take the money and leave Hong Kong at once. During the phone call, they are attacked by Ko's men. Wong and Garoni prevail. Wong then attempts to interrogate one of them, who sets off a grenade in a suicide attempt to kill them. They are taken to the police station in Hong Kong, and are scolded by the Royal Hong Kong Police chief superintendent Whitehead for the ruckus. Whitehead refuses to believe that Ko was behind the attack, and tells the cops about Ko's charitable reputation in Hong Kong. Apparently, at a press conference, Ko will announce that all the winnings from a race horse he owns will be donated to charity. The next day, Garoni and Wong go there and embarrass Ko by publicly showing the crowd his attempted bribe to them.

The next day, Wong, Jones, and Hing Lee's daughter Siu Ling visit Mr. Lee to see what he found. But instead, they see that Hing Lee has been killed and his boat burned. At a loss for information, Wong and Siu Ling visit a fortune teller. He cryptically informs them that Garruci has come to Hong Kong to make an exchange for Laura Shapiro. But he warns them that if they interfere, there will only be death and betrayal. Meanwhile, Garoni follows Garruci to a shipyard, and deduces that it is Ko's drug lab with Laura Shapiro inside. In a meeting between Ko and Garucci, it is revealed that Shapiro's daughter was kidnapped because her father did not pay for Ko's last shipment, which Garucci said was a "simple misunderstanding".

Wong, Garoni and Jones go to the drug lab. They destroy it and save Laura in the process. Garoni, however, fails to escape with them after being shot by Garucci. He is held hostage unless Billy returns Laura to Ko. Wong decides to leave her with Superintendent Whitehead.

Wong meets Ko and Garucci at the shipyard. He sees that Garoni is still alive, but then learns that Superintendent Whitehead was on Ko's payroll the whole time, and is now holding Laura hostage (confirming the "betrayal" that the fortune teller warned about). Garucci then engages Wong in a hand-to-hand fight, which Wong wins despite Ko's attempts to cheat and help Garucci. Then Wong dispatches Ko's guards. He is about to kill Ko, when Garucci comes after Billy with a cut-off saw. In the ensuing fight, Garucci's saw hits an electric panel, and he dies electrocuted. Stan Jones and Siu Ling arrive to help rescue Garoni and Laura. Ko escapes in a helicopter, and Billy goes after him, but a guard blocks his way. Billy and the guard fight on a cargo lifter. Wong prevails by knocking the guard off to his death. Garoni goes outside with the gang and kills a sniper, saving Wong. Wong makes it inside of a crane, and kills Ko by dropping the contents of the crane onto his helicopter.

With Ko dead and Laura saved, Billy and Danny are given a NYPD Medal of Honor.

Hong Kong Version (aka Jackie Chan's personal edit)

Although the basic narrative of this edit is the same as the US version, Chan added a subplot to provide more depth to the movie, which slightly changes the story's progression.

The plot here begins to deviate from the US version after Danny Garoni and Billy Wong leave the massage parlour. The next day, Wong goes to a theater to look for a woman named May-Fong Ho. However, the woman he is looking for goes by the name Sally, and Wong quickly deduces who she is among the dancers with whom she is rehearsing. Wong disturbs her during the rehearsal by showing her the coin of Tin Ho, whom Sally knows. But she denies having any friends from New York and tries to avoid Wong. Two men competing for Sally's affection try to fight Wong but are easily beaten before Wong pulls out his gun, ending the fight. He explains to them that he is a policeman. Wong and Sally then go to a restaurant, where she reveals that her father and another man were partners of Harold Ko. Ko later killed her father. She changed her name in order to hide from Ko. She tells him to visit Hing Lee, her father's partner, and instructs Wong to show Tin Ho's coin to Lee in order to gain trust. Unbeknownst to Sally and Wong, one of Ko's men overhears the conversation.

After this scene, the plot stays the same as the US version until after Ko's press conference. After the press conference, Benny Garucci expresses his concern to Ko's bodyguard, Dai-Wai Ho, about Garoni and Wong's knowledge of their drug operation. Ho tells him that there is a way he can help.

Later that night, Hing Lee meets with his contact Wing at a seafood warehouse to find information about Ko. Wing tells Lee that Laura Shapiro is being held at the shipyard, among shipping containers with Ko's heroin factory. They are suddenly attacked by a group of men with ice picks and Benny Garucci. Wing easily beats up everyone but Garucci, who kills him in a fight.

Later, Wong meets with Hing Lee's daughter Siu Ling to see what information Lee found. They arrive at the warehouse, but find Lee's and Wing's dead bodies. Realizing that Sally may be in danger, Wong pays her a visit. He soon deduces that Sally's substitute maid works for Ko, and has planted a bomb under Sally's bed. Wong defuses the bomb. Minutes later, the massage parlor manager arrives to warn Sally that Ko is coming after her. Sally reveals that the manager is actually her uncle and an outcast in her family. The manager had been demoted and fallen out of favor with Ko after failing to kill Hing Lee, Garoni, and Wong, and that they are aware of Wong's visit with Sally. After the uncle arrives, more men working for Ko arrive to kill them, but they fail and retreat. Sally's uncle tells Wong that Laura is being held at a shipyard, where among containers is Ko's drug factory. With this new information, Wong calls Garoni and instructs him to keep watch over Ko's shipyard. After the scene of Garoni spying on Ko's shipyard plays, Wong escorts Sally and her uncle to the airport, and instructs them to find his contact in the United States so that they can build a new life and start over.

After this scene, the plot of this edit is the same as the original US version.

Scenes in the US

• Punk gang ("the Indians") robbing the truck driver [trimmed for pacing, use of alternative shots]
• Michael & Billy Wong driving from the stripped truck to the bar (heavily trimmed for pacing)
• Bar shootout (use of alternate angles, slightly trimmed)
• Billy Wong asks a civilian where the black bearded crook who shot Michael has gone. (added)
• Wong chasing the black-bearded crook on foot and by boat. (re-edited and trimmed)
• Michael's funeral. (deleted)
• African-American cop tells Wong "Billy, we are with you" (in Cantonese) after Wong is scolded by the captain (added)
• Garoni's racial slur towards Wong ("chink") is dubbed in Cantonese to be "you boy".

Scenes in Hong Kong

Changes to content

• All cursing has been excised and American slang replaced. The HK edit dubs all of the English dialog without properly translating the cursing, sometimes changing the entire context of lines.
• All nudity with women has been excised, with the drug lab re-shot to show fully dressed lab workers, and the nude masseuse being deleted.
• The score is slightly different in certain scenes, and Chip Taylor's song "One Up for the Good Guys" during the end credits is replaced with a replayed upbeat theme from the movie's score.

Deleted/Extended Scenes

Almost all of the Japanese version is edited to match the Hong Kong version, but it contains some scenes that were cut out of the Hong Kong version. Some scenes were given a different Cantonese dub to keep the original context of these scenes intact, as they were in the Glickenhaus version. These scenes are:

• Garoni & Wong's first visit with Superintendent Whitehead & the latter conversation with the inspector. The latter conversation was kept in the Japanese version, requiring a new Cantonese dub.
• Garoni & Wong talking about their plans outside the police station after their second visit with Whitehead (deleted from the Hong Kong version)
• Garucci & David Ho talking in their car after leaving the airport (exclusive to the Japanese version)
• Garucci & David Ho talking after Ko's press conference (slightly different Cantonese dub to change context)
• Garucci exchanging money with Ko at his office (deleted from Hong Kong version)