Silver-Age team origin.
Origin and 1st appearance Adam Strange. See notes at original printing for the creative credits listed.
Origin recap.
Origin and 1st appearance of Challengers. Partial reprint.
Text story with two small illustrations.
Silver-Age origin.
Origin and 1st appearance J'Onn J'Onzz.
Script (only) attributed to Jack Miller by Rich Morrissey, but disputed by Bob Hughes. Samachson is current DC credit, as seen in Showcase Presents: Martian Manhunter (DC, 2007 series) #1.
Origin and 1st appearance Flash.