Alien Nation (film)

Alien Nation is a 1988 American science fiction action film directed by Graham Baker. The ensemble cast features James Caan, Mandy Patinkin and Terence Stamp. The film depicts the assimilation of the Newcomers, an alien race settling in Los Angeles, much to the dismay of the local population. The plot integrates the buddy cop film genre with a science fiction theme, centering on a union between a veteran police investigator Caan and an extraterrestrial Patinkin the first Newcomer detective. The duo probe a criminal underworld attempting to solve a homicide.

The year is 1991 three years since an unidentified flying object bearing 300,000 enslaved aliens, the Newcomers, landed in the Mojave Desert on planet Earth. Los Angeles later becomes their new home. Matthew Sykes Caan, a police detective, loses his partner Bill Tuggle Brown in a shootout. The detectives were trying to stop two Newcomer criminals murdering another Newcomer named Porter at a grocery, in what appeared to be a robbery.The next day, Sykes superior Captain Warner McCarthy, informs his squad that they will have to work with the newly promoted Newcomer detective Sam Francisco Patinkin. Although biased, Sykes enlists to work with Francisco to investigate a similar homicide with a Newcomer named Warren Hubely feeling that if he investigates that crime, he will also find opportunities to investigate his partners death which he is officially forbidden to do. ........

Source: Wikipedia