Before the fall of the Nexus, Andromeda was an elite gravitic engineer who saved the heavily populated island of Mishima. When a reactor malfunction sent a dozen islands hurtling straight at Mishima, Andromeda aimed anti-gravity pulses to repel those islands and saved countless lives.

So impressed was the hidden Crogenitor Zelem by the brilliance of his "child," that he revealed his presence in the Nexus to her with a series of cryptic communications that eventually led her to his enclave. Once she arrived, Zelem made her his protg along with the other genetic heroes he'd created, teaching her as much as she could learn about Crogenitor cosmological and gravitic theory.

When the Darkspore invaded, Zelem either died in the attack, or disappeared. Deprived of her mentor, Andromeda constructed a series of gravity weapons, fighting alongside Zelem's other genetic heroes on guerrilla strikes against the Darkspore controlling the Nexus.