The Cambrian was the first Nation of Thomas Wootten. Set primarily about 500 million years before present, its primary population was of intelligent trilobites and other underwater-dwelling species. It interacted with the Nations RP universe by time travel, usually working on a "fixed offset" to avoid creating paradoxes. In later times it underwent a name change to Mascarene as a result of a civil war. In August 2009 real world time, the time travel was cut off, and the remaining Mascarenian citizens in the present flew off beyond the Virgo Supercluster and thus left the Nations RP.