Dave Grohl returns to his musical roots, while the Foo Fighters prepare to record at Seattle's Robert Lang Studio with Death Cab for Cutie's Benjamin Gibbard. Dave sets his focus on the Seattle music scene, mainly the grunge movement and its implications in American Rock Music. Interviews with Chris Cornell, Nancy Wilson, Bruce Pavitt.

Dave Grohl discusses New Orleans' unique music history with Dr. John, Allen Toussaint and Cyril Neville. The band records in Preservation Hall and also performs with the Preservation Hall Jazz Band. The song 'In the Clear' is recorded during this episode.

In 1799, the German scientist Alexander von Humboldt embarked on a perilous journey of discovery across South America. It would take him to the deepest jungle near the Orinoco and to the heights of the Andes. His aim was twofold: to conduct the first scientific survey of South America and to discover how the natural world actually works — at a time when most scientists believed that the world was created less than 6,000 years ago. He later became a leading scientific figure and champion of the abolitionist movement in the US.
This extremely visual docudrama follows Humboldt’s extraordinary path. Travelling in Humboldt’s footsteps is historian Andrea Wulf, whose book on Humboldt became a worldwide bestseller. For good reason, since Humboldt’s ideas on the planet’s fragile web of life are as important today as they were 220 years ago.

Los Angeles' highly influential position in rock history is examined. Pat Smear remembers the days of Germs, and visits legendary KROQ disc jockey Rodney Bingenheimer, owner of a 1970s Sunset Strip club that became the hub for the Los Angeles glam rock scene. Foo Fighters head to the desert to record their new song 'Outside', which features a solo from Eagles' guitarist Joe Walsh, at Rancho De La Luna, and in turn, Kyuss and the 1990s Palm Desert Scene is explored.

NASA's brand-new Mars rover is on the hunt for alien life, and with the help of cutting-edge engineering, scientists embark on a search for fossilized remains, which might prove the Red Planet was once home to a vast ocean and extraterrestrial life. Perseverance carries seven scientific instruments to study the Martian surface at Jezero crater. It carries several cameras and two microphones. The rover is accompanied by the helicopter Ingenuity, which will help Perseverance to scout for locations to study.

Putin returns to power under a storm after a four-year absence, but his attempts to improve his popularity are hobbled by accusations of corruption. The final part of this sinister history doesn’t quite come up to date with Vladimir Putin’s recent moves to 'reset' the Russian constitution so he can rule, theoretically, until at least 2036 – longer than Stalin. But it does walk us through some of his other moves to entrench power, including vote-rigging in parliamentary elections that was so brazen, his approval ratings fell amid mass street protests. Leading the protests was opposition leader Boris Nemtsov, who was then simply gunned down on a street near the Kremlin.
These days, we are told, the world stage interests Putin more than the Russian one, and with various 'mini-Putins' installed around the world, his legacy looks safe.