Just when we thought the superhero genre had wrung the last of its ability to shock from its tights, “Peacemaker” drops an orgy into its second season premiere. Series creator James Gunn doesn’t include the sex-a-palooza simply because he could; the scene highlights the depths of the namesake hero’s despondency.

Peacemaker, the alter-ego of Christopher Smith (John Cena), is frowning, drug-numbed, and the only fully clothed, unattended person in the center of the naked rager he’s hosting. Everyone in this anything-goes skin tornado is ecstatic but him. Then something subtle but definitive occurs as Chris rises off his couch: a man and a woman lean in and nuzzle his neck, coaxing both a shiver and a smile out of him. If Chris weren’t miserable, he’d tangle with either or both. Instead, he s

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