Galactus is a creation of the Irken Empire who destroys planets deemed unworthy or infavorable to the empire.
Created through fusing a mutant with a supernova, Galactus is the empire's greatest ally. He currently helps the armada in conquering planets and deciding if they are worthy to be destroyed. Galactus is a super being who fights only for the Irken Empire and desires to help them conquer the universe and destroy The Resisty.
It was revealed that Galactus was soon to be corrupted by Dusq, so the Irken Armada (Along with Krenzo) destroyed Galactus.