The American movie titled Double Impact and directed by Sheldon Lettich was released in 1991 and is categorized as action.
Key cast members of Double Impact include Jean-Claude Van Damme.
The plot of Double Impact is: The story begins with the opening of the Hong Kong Victoria Harbour tunnel by business partners Paul Wagner and Nigel Griffith. Paul attends with his wife, and their twin infant sons, Chad and Alex. However, after the celebrations, the family is followed home by a Triad hit squad on orders from Griffith and crime lord Raymond Zhang. A shootout ensues, in which Paul and some henchmen are killed. Paul's wife begs them to spare the kids but is killed by Moon (Bolo Yeung), the top henchman. Chad is rescued by the family bodyguard, Frank Avery, and raised abroad. Alex is dropped off on the doorstep of a Hong Kong orphanage by the family maid.
In the present day, Chad and Frank are running a successful martial arts business in Los Angeles when Frank reveals a new "business" for the two of them in Hong Kong. Frank also tells a surprised Chad that he is not his uncle. Soon after arrival, they find Chad's long-lost twin brother Alex and Frank explains their shared past. It is revealed that Alex would never wear black silk underwear, the only discernible difference between the identical twins. Alex also has a girlfriend who works for Griffith’s company, Danielle Wilde. After escaping the Hong Kong Marine Police for trying to illegally sell foreign cars with electronics inside, Chad (mistaken for Alex) is taken in by the Triads to discuss the incident. During the interrogation, Chad learns about a drug lab in Causeway Bay.
Alex and Chad arrange to destroy the lab by planting C4 in the complex one night, but Chad's clumsiness triggers a massive gunfight. The lab is destroyed, but Alex loses any respect for Chad. Later, Danielle and Alex talk on a ferry and discuss a meeting that will take place soon in a night club in Hong Kong, with Zhang and other bosses in attendance. Alex, Chad and Frank endure their third mission to take down Zhang using Cognac boxes with C4 encased in them.
Zhang discovers that both Chad and Alex are not only twins, but the twins from 25 years ago. Danielle locates the document she had been sent to recover, but is stopped and sexually harassed by Kara, Griffith's muscle bound assassin. She reports her findings to Chad, who goes to meet her alone. He brings her to one of Alex's hideouts in a bar, but they are forced to flee when the Triad comes looking for them. Due to an incomplete phone call, Alex suspects Chad of having an affair with his girlfriend and starts drinking heavily as he dreams of Danielle and Chad having sex. He attacks and fights Chad in a drunken rage upon his return, after which the brothers angrily part ways.
After a massive hangover, a sober Alex returns to the house to find it being raided by armed soldiers working for Griffith and Zhang, who capture Frank and Danielle. They are taken hostage on the Golden Glory ship's furnace room where they are tortured. Despite the ongoing tension between them, Alex and Chad join forces to infiltrate the ship and rescue Frank and Danielle. The duo, well-armed, arrived at the ship where they fight their way through Griffith and Zhang's henchmen. While Chad fights and kills Moon, Alex saves Danielle but not Frank, following his escape. Kara is also killed by a knife in her chest. After a climactic showdown, Chad and Danielle are confronted by Griffith who tried to kill Chad with a big vehicle. Chad fakes his death by jumping to the sea, and then, he kills Griffith after getting into Griffith's vehicle. Alex kills Zhang by making him fall to his death, and Frank comes out alive, the duo are reunited as they decide to put their rivalry aside..
