Superman is trapped in a far-flung future, fighting alongside one of his own descendants for an Earth he doesn't recognize. Here, the House of El has been fractured and lost, exiled from Earth and hunted by its enemies. Can Superman reunite the Els in time to save the universe from his most powerful enemy and find his way back to his own time? Familiar faces return, and a terrifying villain makes his first appearance in Book of El 's explosive second issue!