I suspect they want bodies to implant or grow the 'aliens' into.And yep, they hung us over a cliff until next season (?) with Emily's adventure inside the alien craft.
Why are the babies in there (and seemingly doing well) and what are they sucking out of/putting into that guy she found?
It's easy to watch, doesn't ask much from you. The acting ranges from very good to good enough. The writing has many problems common to TV writers, they don't know how guns work, most scenes are two people talking while everyone else watches, the military don't act like military, the science is gobblygook, philosophical musings are generally childish. None of it is bad enough to get on my nerves so I watched all of it.Is this worth watching or not?