The skins aren't made by me, obviously. I can't make skins to save my life. These wonderful Invasion! sets are by Auberginesims. I've geneticised and townified their birthmark sets in completion to the normal skins, who I had already gen&town'd. All three skin set are in the zip simply for completion and a text file of the genetic values are included, if you're interested in that. Note; the alien skins are not fiddled with. In case you do want the alien skins to be townified, so they show up on NPCS and townies, just ask me. It's an easy and quick fix. :D
And underneath this, 24 sims I've shown earlier at Tumblr. All of these sims use the gen&town skins. They're all packaged with the CC, however I can make CC free packages on request. Some of the sims wear a couple of clothing defaults though.