S1.E5 ∙ The Great DyingWhat caused the Permian extinction event, better known as the Great Dying, 250 million years ago, the Earth's most severe known extinction event.
S1.E7 ∙ Fire & IceWhat caused the Quaternary extinction event during the late Pleistocene some 75.000 years ago that killed off the giant mammals and almost even made the early human race extinct.
S1.E8 ∙ The Next ExtinctionCould humans survive the next extinction event and what could this event be.