SPOILER ALERT: This story discusses major plot points in “Full Nelson,” the Season 2 finale of “ Peacemaker ,” now streaming on HBO Max.

When “Superman” premiered in July, it served as the first big screen introduction of the new DC Universe, as overseen by DC Studios co-chiefs James Gunn and Peter Safran. But it turns out that Season 2 of Gunn’s HBO Max series “Peacemaker,” which concluded on Thursday, provides an even more crucial launching pad for the overarching story Gunn aims to tell within the DCU, with the introduction of two major new elements to the franchise from the DC Comics: The covert agency Checkmate, and the metahuman prison planet Salvation.

As Gunn explained in a virtual press conference on Tuesday (which Variety moderated), Salvation will play a central role

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