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Supergirl (2016-) #21
eBook
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Mourning the loss of the Kryptonians wiped out by Rogol Zaar, Supergirl decides to play detective and sets off into deep space to learn more about the would-be usurper. Using whatever tech she can scrounge, Supergirl builds a star cruiser, and after intel from Green Lantern, she blasts off into the cosmos with Rogol Zaar’s deadly axe to solve the mystery-along with a traveling companion you won’t believe!