User blog comment:Thailog/Ep. 125 "Usual Suspects" discussion/@comment-3094698-20120414215356/@comment-1038387-20120414225307

Oknight, if you have money to spare: "Icon: Mothership Connection". It's a good (though heavy) read that explores most of their origin. A trade paperback collection of Icon's old series, written by Dwayne McDuffie and penciled by M.D. Bright.