This issue contains the following material that was originally printed in various comics previously published by DC.
"Powerstone"
reprinted from Action Comics (1938) #47
"When Titans Clash!"
reprinted from Superman (1939) #17
"The Fire Murders"
reprinted from More Fun Comics #57
"Meet Hawkwoman"
reprinted from Flash Comics (1939) #24
"An Untitled Black Condor Story"
reprinted from Crack Comics #18
"The Return of Zor"
reprinted from More Fun Comics #57
"The Menace of the Invisible Raiders!"
reprinted from Adventure Comics (1938) #67
"Music Hath Charm"
reprinted from Smash Comics #17
"Superman's Greatest Feats"
reprinted from Superman (1939) #146