Caveman2Cosmos is a CivFanatics.com community mod that add new features, gameplay, and content to the Civilization 4 experience. It is the most expansive Civilization 4: BTS mod to date with almost daily updates since November 2010. It is the spiritual successor the The Civilization 4 mod Rise of Mankind and its addon A New Dawn, and combines the work of over 100+ CivFanatics.com past and present modders to create a mod to "rule them all".

It is currently being developed by StrategyOnly Productions with a modding team made up of prominent members of CivFanatics.com.