It's an Inferior Species
A mission to Mars leads to two members of the crew becoming infected with the alien dna with things getting worse when a new alien human hybrid emerges from a cocoon. With the government and military becoming aware that they have a new alien predator they seek out the help of Dr. Baker (Marg Helgenberger) and Press (Michael Madsen) who in turn call on the services of a now genetically modified Sil (Natasha Henstridge) who is now called Eve to capture this new danger.
There are many who reckon "Species II" is the worst movie ever made, it isn't but it certainly is poor. And the reason is simple as the people behind thought they could get by on the trio of elements which made the original movie. As such we have more of the eye catching Natasha Henstridge, we have more okay alien special effects, and we have more soft erotica thanks to the predator being hornier than ever. The trouble is these elements whilst for some are going to be entertaining, maybe those who watch because they want more topless Natasha Henstridge for anyone else these things are not enough.
Now there is of course the storyline involving a new predator as well as some new characters including Peter Boyle who shows up as a doctor who has been sectioned in a mental institution. But the storyline not only plays second fiddle to the trio of elements which worked the first time around but is so full of nonsense that to be honest you start to switch off and wait for another scene of soft erotica to show up.
What this all boils down to is that "Species II" is a perfect example of a poor sequel because of those behind it thought they could get away with just the basics which worked the first time around. It means if you are watching for anything more than special effects, nudity and Natasha Henstridge you are likely to be disappointed.