By sheer coincidence, there was a TV mini-series shortly after The Hidden, featuring a tough cop on a weird murder case who is annoying joined by a quirky person who seems to know too much, and proves to be a friendly alien hunting down an evil alien who hides in people’s bodies.
The friendly alien was a woman (a hot one, of course), though, so it was completely different. The mini was popular enough that it spawned a very short-lived TV show.