DC Studios co-CEO James Gunn named Peacemaker ‘s season two finale “Full Nelson ” for the craziest possible reason: He recruited the actual band Nelson — ultra-blonde twin brothers Matthew and Gunnar Nelson, who reigned over MTV in 1990 with the Number One hit “(Can’t Live Without Your) Love and Affection” — to perform onscreen during the episode’s emotional peak. First, we see Eighties-metal connoisseur Christopher Smith, a.k.a. Peacemaker (John Cena), pull Emilia Harcourt (Jennifer Holland)