"Nucleus, Prologue"
Continues in Adventure Comics (1938) #516.
*Discover all-new allies, enemies and adventure as The Atom leaps from the pages of Brightest Day into this one-shot special! Rising stars Jeff Lemire and Mahmud Asrar update the Atom's origin and kick off the tiny titan's next major story, which continues this month in Adventure Comics #516. If you thought you knew Ray Palmer, then think again! The smallest hero in the DCU is about to become one of its biggest, and the excitement starts right here! *Source: dccomics.com