The Limitless Dimension, also called Skye's World, is blah blah blah (I need to find the words) There are a handful of differences between this dimension and the Limitless one. The most important being that the Doctor is not the only Time Lord. Skye Davis is the most notible. Skye believes that there are Time Lords scattered through out space and time. Another difference is the alien life forms. In the Limitless Dimension there are Golics, peilis, and the Darkness (similar to the vashta Nerada)