The love scene. Completely gratuitous! There was no chemistry between the hero and the heroin. In fact, the only way one would know that there was any kind of attraction between them was that it was briefly established in the beginning that they used to be in a relationship. Then, for no apparent reason, in the midst of all this danger and alien creatures in the same building with them, bam. They go at it. Then, as if nothing had happened, the rest of the movie they continue on their way with absolutely no chemistry to the very end.