Lost Galaxy

The Lost Galaxy is a galaxy 5.23 x 1029light years away from the Milky Way. This galaxy is where beings like the Galactobeasts, the Sulkans, Yoshimitsurugi, and El Doryu called home.

Bad Past
In the "Bad Past" timeline, El Doryu joined forces with the Kyrion Army and eventually obliterated the entirety of the Phoenixgarde Army as well as Sulkan itself in the Battle of Sulkan. It was here that the Galactobeasts were called to action.

Trivia

 * The Lost Galaxy is named after the seventh season of Power Rangers, Power Rangers: Lost Galaxy.