Alien Nation is a 1988 science fiction film written by Rockne S. O'Bannon and directed by Graham Baker. It stars James Caan, Mandy Patinkin, Terence Stamp, and Kevyn Major Howard.
The following year, the film's plot … see full wiki
This is a great buddy cop flick with a sci-fi element. There are aliens but they are mostly used as a device in this movie for commentary on immigrants' effect on the job market and for other topics throughout the other Alien Nation movies and TV shows. A bit formulaic, but a fun movie though and James Caan is great.