Today, Etheria celebrates the coronation of its new king, Zed, the son of former Queen Glimmer of Brightmoon and the Emperor of the Known Universe, Horde Prime. It's the beginning of a new era and everything is perfect in the eyes of Prime. But after eighteen years under the rule of that ruthless leader, Glimmer finally seeks revenge.

Bold of you to assume that there is only one universe. The Best Friend Squad encounter the Adora of another dimension, helping her deal with her world's war with the horde.

An unexpected arrival on Etheria crates problems, opportunities, and a lot of confusion for everyone involved.