JSA, book 10: Black Vengeance
Geoff Johns et Collectif2006

Stargirl's life is irrevocably changed when her adoptive family are murdered, part of a devious plan by the maniacal time-travelling villain Per Degaton to eliminate members of the JSA from the past, present and future! Can the JSA save themselves from almost certain annihilation as well as stopping the assassination of the President of the United States?
(Collects JSA #66-75)