Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
12 Episodes 2019 - 2025
Episode 1
Wed, Apr 29, 202624 mins
Episode 2
Wed, Apr 29, 202624 mins
Episode 3
Wed, Apr 29, 202624 mins
Episode 4
Wed, Apr 29, 202624 mins
Episode 5
Wed, Apr 29, 202624 mins
Episode 6
Wed, Apr 29, 202624 mins

Episode 7
Wed, Apr 29, 202624 mins
Episode 8
Wed, Apr 29, 202624 mins
Episode 12
Wed, Apr 29, 2026
66 million years ago, an asteroid slammed into Mexico's Yucatán Peninsula, causing a dinosaur mass extinction. With over 700,000 asteroids in space, what's in store for humanity and our planet if it happens again? Could humanity survive such a catastrophe? Explore the potential threats from space and what science is doing to prepare us for the unthinkable.
Episode 60
Wed, Apr 29, 2026
By examining countless Megalodon teeth from around the world, scientists have concluded that "meg" was able to achieve its gargantuan proportions by starting its carnivorous diet early - in the womb. Dive into the mysteries of the Megalodon, an enormous prehistoric shark that once ruled the oceans. Scientists have been comparing the Megalodon to the modern great white shark, and studying how it could have grown so large. How did the Megalodon dominate the ancient seas? How did environmental changes and the Meg's hunter-prey dynamics affect its survival?
Episode 63
Wed, Apr 29, 2026