Illustrated with vignettes from World's Finest Comics (DC, 1941 series) #94 (May-June 1958) [Superman, Batman & Robin vignette], from Mystery in Space (DC, 1951 series) #53 [Adam Strange vignette], from Detective Comics (DC, 1937 series) #225 (November 1955) [John Jones vignette], from Showcase (DC, 1956 series) #4 (September-October 1956) [Flash vignette], and other sources.
Silver-Age team origin.
Origin and 1st appearance Adam Strange.
Origin and 1st appearance of Challengers. Partial reprint.
Credits for original printing updated 10/06 by Bob Hughes.
Letters credit 3/07 by Rodrigo Baeza.
Text story with two small illustrations.
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 [Barry Allen].