Challengers of the Unknown in "Yesterday's Clues, Part 3 of 5"
Sandman in "Crime Carnival"
Story reprinted from Adventure Comics #84.
Superboy in "The Secret of the Seventh Super-Hero"
Story reprinted from Adventure Comics #290.
Superboy in "The Legion of Super-Traitors!"
Story reprinted from Adventure Comics #293.
Aquaman in "Underworld Reward"
Story reprinted from Aquaman (Vol 1) #44.
Captain Marvel in "The Man Without a World"
Story reprinted from Captain Marvel Adventures #141.
The Spectre in "Die-Spectre, Again!"
Story reprinted from Spectre (Vol 1) #2.