The Ice Age odyssey begins in the 'land of the sabre-tooth' - North America, a continent that was half covered by ice that was up to two miles thick. Yet this frozen land also boasts the most impressive cast of Ice Age giants in the world.
High in the mountains of Transylvania, a cave sealed for thousands of years reveals grisly evidence for a fight to the death between two starving giants, a cave bear and a cave lion. These animals, which would dwarf their modern-day relatives, were probably driven into conflict by the pressure on food supplies as the Ice Age gathered pace.
Astonishingly, even after thousands of years of ice crushing the northern hemisphere and temperatures of 20 degrees lower than those of today, many of the great giants of the ice age still walked the earth. It was only when the world had warmed up again that mammoths, woolly rhinos, sabre-toothed cats, giant ground sloths and glyptodonts finally became extinct. Alice sets off on her last voyage back to the ice age to discover why.