Get under the skin of ice age megabeasts as Steve tackles a murder mystery in a U.K. cave filled with oversized animal remains; discover the sabre-toothed tiger's strengths and weaknesses with Michaela; see what woolly mammoth DNA has to say.

Steve and Michaela uncover the story of Neanderthals versus Homo sapiens and their struggle to survive.

Take a look at the consequences of the great thaw; search for lost land bridges, find out how creatures coped with all of the new liquid water that surrounded them; learn what may happen if the planet plunges into another ice age.