Action Comics #1072

The secret history of one of Superman's oldest friends, Mon-El, is revealed...and his deadly connection to Xa-Du, the Phantom King, leaves Superman speechless! The Man of Steel's mission into the corrupt heart of the Zone continues in the most shocking installment yet of the Action Comics weekly as the grand villain behind its peril stands poised to strike! Plus, Supergirl finds herself in pursuit of an assassin seeking justice of their own!