I think I might've mentioned this before, but now I'm actively looking for this movie. Merla and I were watching it on TV and then the powet went out with less than five minutes left in the damn thing.
I think it might've been made/released anywhere in the neighborhood of the mid/late eighties to early nineties.
There's an alien criminal and another alien, a good alien, is chasing him. They crash on Earth and the bad alien takes over somebody. I don't really remember but it is possible the people had to be dying to be possessed. It is possible that the bad alien just took over whoever he wanted. The good alien also takes over someone, possibly a detective that died, and continues chasing the bad alien. We think they were worm things or something. The bad alien kept hopping bodies. Near the end, I think the bad alien's all skittering about a screaming crowd and someone (possibly the good alien in his human body) is shooting at it. I didn't see as much of the movie as Merla did, but I thought it took place in a city-type environment like New York or L.A.