A cross-over that’s about 90% Settlers of Catan and about 10% Trek, you start with two small outposts at the intersection of 3 planets, with each planet supplying certain resources (dilithium, titanium, food, oxygen, water). You build starships, connect Galactic regions, and establish more Outposts and Starbases (upgraded Outposts) and so on, and so on… Be careful, though, the Klingons are watching!