Cobra is a 1986 action movie starring Sylvester Stallone as a cop, Reni Santori as his partner, Stockard Channing as a crooked cop, and Brigitte Nielsen as a witness to a crime.
Marian Cobretti, the policeman played by Stallone, shoots a kidnapper at a supermarket to death. Before dying, the kidnapper declares something about the way of the new world. Unknown to Cobretti, he was referring to a group of criminals whose intent was to kill every outsider and rule the world by themselves.
One night, the group decides to go on a string of killings around Los Angeles. They murder, among others, a woman in her car and a security guard. The only one to escape their carnage that night is the character played by Nielsen, who witnessed the murder of the guard. As a witness in extreme danger, she is put in protective custody and handled over to Cobretti and his partner.
Because there was a crooked cop on the force who was a member of the criminal gang, the gang always finds the witness, but their several attempts to kill her are halted by Cobretti and, to a lesser extent, by Cobretti's partner. Later on in the movie, the viewer learns that it was Channing's character who was the bad cop with a membership in the criminal gang.
As the movie goes on, Cobretti and his protected witness fall in love, and they change locations various times, with the resulting confrontations between them and members of the gang each time they are found. All that leads to a final scene where Cobretti and the gang's leader, a blond, big and muscular type, face each other in a no holds barred confrontation inside a factory, and Stallone picking up the muscular man and placing him in a large, iron hook that then took him to a burning machine.
Cobretti and Nielsen's character then fall in love and get on the road on Cobretti's bike for the movie's final scene.