As a documentary series, Planet Earth II does not have a conventional plot with twists in the fictional sense. However, its narrative structure across the six episodes builds towards a powerful and revealing conclusion. The 'finale' is the thematic culmination of the series, which shifts the focus from the seemingly remote wilderness to the audience's own backyard.
The first five episodes—"Islands," "Mountains," "Jungles," "Deserts," and "Grasslands"—immerse the viewer in distinct, awe-inspiring habitats. They establish a pattern of showcasing incredible animal behaviors and brutal survival dramas. Key moments include the famous victory of a baby iguana escaping a legion of racer snakes; the rare, intimate glimpse of snow leopards in the Himalayas; a jaguar's successful hunt on a caiman; lions being thwarted in their attempt to take down a giraffe and later a massive buffalo; and the sad fate of baby turtles disoriented by city lights.
The major 'reveal' of the series comes in the final episode, "Cities." After five hours of spectacular footage from what many viewers would consider 'nature,' the show turns its cameras on the urban environment. This episode reframes the entire series by making an explicit connection between the wild and the human world. It reveals that the forces of nature—adaptation, competition, and the struggle for survival—are just as present in Mumbai, New York, and Jaipur as they are in the Serengeti. The hidden meaning, which becomes clear only at the end, is that there is no longer a clear line between the human world and the natural world. The series finale reveals that humanity is the single most dominant force shaping every habitat on Earth. David Attenborough's closing monologue from the top of The Shard in London is the ultimate spoiler: the fate of every animal shown in the preceding episodes is inextricably linked to the actions of the human viewers watching from their own homes in their own cities. The series is not just a portrait of the planet; it is a mirror held up to humanity, revealing our ultimate power and responsibility.