In this episode, it's the winter and spring. During the coldest months, there are often blizzards on the high peaks while the lowlands are sunny. On the snowy slopes, foxes look for food while a great grey shrike, a ruthless hunter from Scandinavia, looks for animals to eat. Cormorants like to congregate near water reservoirs while red deer hide away in secluded gullies in one of the wildest locations in the Beacons. During spring, the nesting season is in full swing. Hundreds of dotterel rest on the Black Mountain during their journey from Africa to their breeding sites in Scotland, peregrines nest in an old quarry in the Central Beacons. Next to the largest natural lake in south Wales, water voles are managing their ditches. Iolo discovers a magnificent diverse landscape with huge caves, stunning waterfalls, ancient woodland and canals. He visits the most crooked church in Britain and an old gunpowder works and meets Kate Mobbs-Morgan who uses a horse to lead timber from an ancient oak woodland; National Park warden Judith Harvey who takes Iolo to one of the best views in the Beacons and Trefor Prothero who teaches Iolo the art of traditional hedge laying. On the uplands near Llandeilo, Stuart Fry is repairing a 300-year-old stone wall.

In this episode it's the summer and autumn. A fox family is playing below the Carmarthen Fans, lizards bask in the sun on limestone pavements in the upper Swansea valley and hundreds of dragonflies emerge from pools in the uplands near Brecon. On the Black Mountain foothills, sheep are gathered by shepherds on horse back and a group of dedicated volunteers are trying to repair the mountaintop. The autumn is the season when the landscape is at its most colourful. It's also a time when thousands of fieldfares arrive from Europe to escape the colder continent. Some feed on berries in trees surrounding the smallest church in Wales. In the Usk Valley, bats feed before they hibernate in caves and migrating ducks on Talybont Reservoir ready for winter. Underground, cave spiders are lurking and in the rivers, sea trout are heading upstream to spawn.