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What If

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Authors: J.J. Gregory
The What If book series by J.J. Gregory includes books Aliens Killed the Dinosaurs, Aliens Built the Pyramids, and Aliens Exterminated the Neanderthals. See the complete What If series book list in order, box sets or omnibus editions, and companion titles.
3 Books
#1
Aliens Killed the Dinosaurs - Book #1 of the What If

Aliens Killed the Dinosaurs

J.J. Gregory
From $16.43
#2
Aliens Built the Pyramids - Book #2 of the What If

Aliens Built the Pyramids

J.J. Gregory
From $14.99
#3
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