Ewan, Charley, and the team land in Ushuaia, the southernmost tip of South America, but tensions arise due to snow and mechanical issues. Traveling 13000 miles over 100 days on electric bikes is hard to imagine. Ewan McGregor and Charles Boorman find out how challenging their mission is as they embark on a journey on prototype Harley Davidsons and the Rivian trucks. The first obstacle is electricity. While parts of the city have no problems with charging the bikes and the trucks, the countryside is where the duo face issues.

A travel across Armenia, one of the most fascinating places in Europe. The marvelous adaptation of the Armenian people, their exemplary spiritual strength and the establishment of enduring culture have made possible ​​the consolidation of a lineage that for millennia, has kept alive the legacy of one of the world's oldest civilizations.

We are in the grip of an allergy epidemic. 50 years ago one in 30 were affected, but in Britain today it is closer to one in three. Why this should be is one of modern medicine's greatest puzzles. In search of answers, Horizon travels round the globe, from the remotest inhabited island to the polluted centres of California and the UK. We meet sufferers and the scientists who have dedicated their lives trying to answer the mystery of why we are becoming allergic to our world.

In episode two, Professor Brian Cox is off to India, where he assesses arguably the first evidence of rational thought in literature, the poetry of the Vedic monks. They pondered mankind's origins, realising there must have been a day with no yesterday - a day of creation - prompting the age-old question of where did the universe come from? Brian marvels that the universe seems to follow a set of rules, the laws of physics, allowing space to be considered on the grandest scale, travelling to the most distant, farthest reaches of the cosmos just by using our minds. Brian also visits Japan, and offers viewers the idea that man lives in just one of an infinite number of universes that are being made all the time.

Andrew Graham-Dixon continues his exploration of German art by looking at the tumultuous 19th and early 20th centuries, and how artists were at the forefront of Germany's drive to become a single nation. Andrew travels to the north and the coastal town of Griefswald, the birthplace of Caspar David Friedrich, the most influential of the German Romantics, to discover how the Baltic coast impacted his mysterious paintings of the German landscape. He also visits Berlin and explores the art of the powerful Prussian state, which would spearhead the unification of Germany in 1871. The episode ends with the outbreak of World War I and the attempts of the artists Franz Marc and Otto Dix to rationalise the catastrophic experiences of the world's first technological war, a war driven by the Prussian innovations.

With optional Hebrew subtitles. Simon Schama's history of the Jewish experience plunges into the lost world of the shtetl, the Jewish towns and villages sewn across the hinterlands of Eastern Europe which became the seedbed of a uniquely Jewish culture. Shtetl culture would make its mark on the modern world, from the revolutionary politics of the Soviet Union to the mass culture of Tin Pan Alley and Hollywood. It was also the birthplaces of Hasidism, the most visible, iconic and, arguably, most misunderstood expression of Jewish faith and fervour. This chapter of the story travels from the forests of Lithuania, where Simon's own family logged wood and fought wolves, to the streets of the Lower East Side where the sons of shtetl immigrants wrote the American songbook. With grim inevitability, the story returns to Eastern Europe in 1940 - where the genocidal mechanisms of the 'final solution' were beginning to grind the shtetl world into dust and ash.