Both Adam and his brother Andy signed exclusive contracts with DC Comics in June 2005. Kubert's first project for DC was illustrating "Last Son", a Superman story arc co-written by Geoff Johns and Richard Donner, which ran in Action Comics #844–847, 851 and Action Comics Annual #11. Further delay forced DC Comics to bring in substitute creative teams and delay the fourth part of the "Last Son" storyline and the 3D issue to #851, which was released in early July 2007. The final part of the storyline was in Action Comics Annual #11. Following his work on Superman he penciled the "Final Crisis" tie-in, DC Universe: Last Will and Testament, written by Brad Meltzer.