Aquaman and Aqualad pay a visit to Ocean Colony Alpha, to see what progress Dr. Larcher has made, in establishing the settlement. Meanwhile, an alien satellite crosses into Earth's orbit once more. The satellite is the last surviving relic of an alien world, long since vanished from the cosmos. Within its structure lies a device that can open a dimensional rift in space and time. That device is triggered by Earth's magnetic field. The rift opens at the deepest point, in the cleft of an underwater canyon. Through the rift, Necrus, the so-called "Black City" emerges. Raiders from Necrus descend on Ocean Colony Alpha, slaughtering all the colonists and razing their structures. The lone survivor of the massacre makes his way to Atlantis, to inform Aquaman of the horrific attack. Aquaman and Aq