Alien possession comes in many forms, as this clip from The Hidden 2 proves. There's Kyle MacLachlan, transferring his alien life essence into another man, in a wonderfully tender moment. And then there's the fluffy dog and the tentacle monster.
Susan Ivanova herself, Claudia Christian, plays a stripper who gets taken over by a deadly alien parasite, in this clip from The Hidden. And yes, that's Kyle MacLachlan investigating. The best part is Claudia inspecting her new body.