"The Flaming Doom" and "The Nightmare Menace" printed as one long story. All but the first panel of the original page 4, the second and third panels of the original page 5, the last panel of the original page 23, the second panel of the original page 24, and the third panel of the original page 25 of "The Flaming Doom" have been omitted here. The original page 1, panels 2 and 3 of the original page 11, and the first three panels of the original page 12 of "The Nightmare Menace" have been omitted here, though the original page 8 was expanded to fill an entire page.
"The Deathless Doom!" combined with "The Day the Metal Men Melted" into one long story. The last two panels of "The Deathless Doom!" were omitted for this reprint, with the remaining panels of that page expanded to fill the page. The original page 1, the bottom two tiers of the original page 5, and the top tier of the original page 6 of "The Day the Metal Men Melted" were omitted for this reprint, though the original pages 8, 16, and 25 were expanded to each fill an entire page.
Inside back cover. Composed of pieces from the fillers in Showcase (DC, 1956 series) #37 and 39.