Challengers of the Unknown in "Contract on a Champ!"
Superboy in "Superboy's Big Brother"
Story reprinted from Superboy (Vol 1) #89.
Legion of Super-Heroes in "The Secret of Mon-El"
Aquaman in "To Win is to Lose"
Story reprinted from Aquaman (Vol 1) #43.
Captain Marvel in "Captain Marvel Faces Fear"
Story reprinted from Captain Marvel Adventures (Vol 1) #89.
Superman in "The Legion of Super-Villains"
Story reprints Superman (Vol 1) #147.
The Spectre in "The Sinister Lives of Captain Skull"
Story reprints Spectre (Vol 1) #1.