Challengers of the Unknown in "All Together Now"
Superboy in "The Boy with Ultra-Powers!"
Story reprinted from Superboy (Vol 1) #98.
The Legion of Super-Heroes in "The Face Behind the Lead Mask!"
Story reprinted from Adventure Comics #300.
Aquaman in "The Explanation"
Story reprinted from Aquaman (Vol 1) #46.
The Marvel Family in "The Mighty Marvels Join Forces"
Story reprinted from Marvel Family #1.
The Spectre in "Stop That Kid, Before He Wrecks the World!"
Story reprinted from Spectre (Vol 1) #4.