I’ve just finished the Extraterrestial Researcher scenario and found it fun but that may have been because I didn’t stick to a single sim. My main sim, Adriel, became a scientist so that he could build the satellite dish to contact aliens, and he also built a rocket ship in the backyard. He began a romance with another sim of mine, Audrey, and they had four children in a home no bigger than 100 tiles ?. Then Adriel finally got to make the satellite dish and got abducted by aliens two nights running (Audrey also got abducted the first night!). On the second night, Adriel ended up pregnant and three days later gave birth to twins! The next day he went to work and found his fifth alien just outside the science facility! So it took 18 days to complete the scenario and I intend to keep playing until Adriel tops his career and gets to visit Sixam.
The weird thing was that his twins did not register as being alien despite being born into alien cribs, and they didn’t get any coloured hair or skin ?. So I cheated them into that occult when they aged up and they are now brightly coloured! However, the girl, Nia, keeps changing appearance every time I go into CAS, and she won’t wear anything apart from the alien diapers. Her brother, however, is fine. One of their older sisters also had the glitch where her hair colour changed as a toddler, so I don’t know what’s going on!