This article is about the fictional races found within the Mass Effect universe. These races are explored in the novels Mass Effect: Revelation and Mass Effect: Ascension, and the video games Mass Effect, Mass Effect Galaxy, Mass Effect 2 and Mass Effect 3. Other than the following, there is also mention that dozens of other intelligent races are known to Citadel space and the galaxy; these races are left unidentified, but new races may appear in subsequent storylines.