Sean Fletcher is in the snowy Cairngorms as we mark the centenary of the death of the great explorer Ernest Shackleton. In this mesmerising yet unforgiving landscape, Sean meets adventurer Mollie Hughes, who solo-crossed the Antarctic following in Shackleton's footsteps, and discovers just how tough it is to train and trek in some of the harshest conditions in the UK. Sean also meets two scouts who are preparing to go on a Shackleton expedition, and learns some vital survival tricks. We also catch up with young naturalist Xander, who is on a mission to help save the northern damselfly, while Adam Henson discovers the damage growing numbers of deer are causing to farmers, and Tom Heap investigates the cost of renewable energy to our rural homes.