1: Eons When Humans Were Prey

2: Eons How Blood Evolved (Many Times)

3: Eons The Humans That Lived Before Us

4: Eons The Island of Shrinking Mammoths

5: Eons The Evolution of the Heart (A Love Story)

6: Eons How 7,000 Years of Epic Floods Changed the World

7: Eons The Island of Huge Hamsters and Giant Owls

8: Eons The Giant Bird That Got Lost in Time

9: Eons When We First Made Tools

10: Eons When Giant Scorpions Swarmed the Seas

11: Eons When We Tamed Fire

12: Eons The Mystery Behind the Biggest Bears of All Time

13: Eons The Croc That Ran on Hooves

14: Eons When We Took Over the World

15: Eons The Ghostly Origins of the Big Cats

16: Eons The History of Climate Cycles (and the Woolly Rhino) Explained

17: Eons The Hellacious Lives of the "Hell Pigs"

18: Eons How Evolution Works (And How We Figured It Out)

19: Eons When the Synapsids Struck Back

20: Eons When Ichthyosaurs Led a Revolution in the Seas

21: Eons When We Met Other Human Species

22: Eons How Volcanoes Froze the Earth (Twice)

23: Eons How Earth's First, Unkillable Animals Saved the World

24: Eons When Giant Deer Roamed Eurasia

25: Eons Was This Dinosaur a Cannibal?

26: Eons The Missing Link That Wasn’t

27: Eons The Raptor That Made Us Rethink Dinosaurs

28: Eons When Bats Took Flight

29: Eons How Pterosaurs Got Their Wings

30: Eons When Giant Lemurs Ruled Madagascar

31: Eons When Antarctica Was Green

32: Eons The Case of the Dinosaur Egg Thief

33: Eons When Hobbits Were Real

34: Eons Were These Monsters Inspired by Fossils?

35: Eons How We Domesticated Cats (Twice)

36: Eons When Giant Hypercarnivores Prowled Africa

37: Eons Why Male Mammoths Lost the Game

38: Eons The Forgotten Story of the Beardogs

39: Eons The Fuzzy Origins of the Giant Panda