Adventures of Superman: Book of El #3

Brainiac returns in a terrifying new form! When Superman's oldest foe discovers the hero's return, Brainiac sends his post-human army, the Summer Men, to lay siege to the ancient Fortress of Solitude! When Ronan Kent learns of Brainiac's role in the subjugation of Earth, can he realize his potential and become the Superman of the future, or will the two Supermen die together? The search for the scattered House of El begins here!