Earth-87 is the title of the universe that appears in Fracture Point.
Dimension 1, also known as the Prime Dimension, is the primary dimension that all others bare similarities to in some way. It is the closest to the "canon" timeline, with some exceptions, such as Ben marrying Ester instead of Kai. It is home to Julius Tennyson, the latest in the Tennyson bloodline.
Dimension 9, also known as the Jade Dimension, is one that will be expanded at a later time. Home to Ka'sari.
To be expanded. Home to Freiya McDowell.
Dimension 21, also known as the Delta Dimension, is the dimension closest to the Prime Dimension. It is home to Julian Tennyson, Julius's alternate counterpart.
To be added