Ambush Bug.Jamie Reyes’ Blue Beetle.Lobo.Justice League Antarctica.The Great Darkness Saga. “BWAH HA HAAAA!” All of these summon Keith Giffen to mind. From his time drawing & co-writing LEGION OF SUPER-HEROES with Paul Levitz – including the immortal “Great Darkness Saga” – to turning JUSTICE LEAGUE OF AMERICA, into JUSTICE LEAGUE,…