So, who are the musical sisters behind the internet sensations Jem and the Holograms? You'll have to wait until Jem and the Holograms rocks out in theaters October 23 to find out, but in the meantime, check out these exclusive Fandango character cards featuring Jerrica/Jem, Aja, Kimber and Shana to give you some backstage info on who's who in the band.