From towering woolly mammoths to elusive snow sloths, terrifying saber-toothed tigers to resilient dwarf elephants (only 3 feet tall),Prehistoric Planet: Ice Age reveals the epic struggles and unexpected stories of animals that once ruled the Ice Age. Journey through vast tundras, barren deserts, expanding grasslands and melting permafrost as these creatures battle for survival in the face of extreme climates, shifting landscapes and the onset of "The Big Freeze," and ultimately, "The Big Melt."

• Tom Hiddleston