The Hidden (1987) 

An alien parasite with the ability to possess human bodies goes on a violent crime spree in LA, committing dozens of murders and robberies. In pursuit of the extraterrestrial criminal is another alien disguised as an FBI agent, and the local officer investigating the rash of violence. As they close in on the vicious intruder, the city faces a brutal threat like no other it has ever encountered. - IMDb


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