The Sphere Builders are aliens from another dimension in the fictional nyota Trek universe. They are bent on conquering the galaxy kwa reconfiguring the fabric of space to make it zaidi hospitable to them using specially designed moon-sized spheres. They were first seen in the 2004 nyota Trek: Enterprise episode "Harbinger". Their technology is responsible for the creation of a region of space known as the Delphic Expanse, where the physical laws of our universe often break down. The Expanse is extremely hostile to residents of our dimension, and those that enter have great difficulty in leaving. The Expanse is also not yet entirely suitable for the Sphere Builders.
kwa approximately the mwaka 2550, the Sphere Builders were on the verge of accomplishing their goal when they created an area habitable to them stretching about 50,000 light years in all directions from the center of the Expanse. However, as Daniels showed Jonathan Archer on board the USS Enterprise (NCC-1701-J), the United Federation of Planets engaged the Sphere Builders at the Battle of Procyon V, where the Federation is led kwa the USS Enterprise (NCC-1701-J). The Enterprise-J is the flagship of the Federation; it is also the most diverse ship ever in the Federation. Serving on board are Vulcans, Andorians, Ithanites, Klingons, Humans, and dozens of other species; including Xindi. The Federation wins the battle and drives the enemy back into their trans-dimensional realm.
The Builders sought to prevent the Federation from ever existing. They went back to the 22nd century, during the days of United Earth and convinced the Xindi that they were going to be attacked four centuries later. After Xindus, the Xindi homeworld, was destroyed, the Sphere Builders helped guide the five surviving species toward habitable planets and precious resources. The Xindi then called them the "Guardians". Like the Triannons, the Xindi referred to the "Guardians" with reverence. Primate Councillor Degra taught his children to thank the "Guardians" at the end of each siku for helping them, just as he was taught kwa his own parents. They manipulated the five races to build a superweapon capable of destroying Earth entirely. They were not satisfied with the killing of seven million people. When the Xindi Council obtained information on the human anatomy, they disagreed on a bio-weapon three-two, so the Builder's representative sent the Reptilians back in time to Earth, Detroit, 2004 to develop it but they were stopped kwa Captain Archer and T'Pol. However, with the help of Daniels and the mysterious benefactor of Suliban Cabal, Archer was able to convince three out of five Xindi races that they were being deceived. With the hivi karibuni events, the Builders had the Reptilians and Insectiods begin the launch early. However, the Enterprise destroyed the weapon and all spheres in the Delphic Expanse, sending the Builders back into their dimension.
The battle figures prominently in the "Azati Prime" episode of Enterprise. However, the subsequent defeat of the Sphere Builders kwa the NX-01 in the 22nd century calls into swali whether the Battle of Procyon V will ever occur in the present timeline.