Re: Crossover with other franchises?
Taran'atar did fight an alien that appears to be a Xenomorph in one of the DS9R books, I can't remember for sure which. That would indicate that something similar to them does exist in the Trekverse.
Over the course of many encounters and many years, I have successfully developed a standard operating procedure for dealing with big, nasty monsters. Run away. Me and Monty Python.
Harry Dresden - Blood Rites (The Dresden Files #6)