Here are my thoughts (SPOILERS): Scarlett takes over for the woman who we see at the beginning of the film. Scarlett instantly begins to hunt her prey after she is provided with a van by the motorcycle men. They are there to clean up after the men she has seduced (such as the tent at the beach, the deformed man, etc.) as well as ensure that she is doing what must be done (there's a scene where one of the men stares at her intently, as if to ensure she has not become like her predecessor). She lures the unsuspecting men into the liquid without remorse. When she falls in the street later in the film and is helped up by several people, she begins to discover humanity. The gentlemen that she sets free because she empathizes with him changes her completely. Now she is the same as the woman whose place she has taken. We see the dark side of humanity when it is discovered that Scarlett is not human, terrifying her attacker at the end, thus he kills her. The only thing I am unsure of is why these men (and women?) are lured into the liquid. Is it for the meat for food (since chocolate cake doesn't suffice), or is for the skin, which the aliens wear? I haven't been able to stop thinking about the film. The soundtrack is perfect. Scarlett Johansson is mesmerizing to watch. With little dialogue, she gave a wonderful performance. This will be a film that I will enjoy for many years to come.