Richard Dawkins spends three episodes making the case for natural selection as the best-evidenced idea in science, and against the creationist and intelligent-design arguments still taught in some classrooms. He sits with British schoolchildren to ask what they believe about the origin of species, then walks them through Darwin's own reasoning using finches, fossils, and comparative anatomy much as Darwin himself did aboard the Beagle. The middle episode, "The Fifth Ape," traces human descent from earlier primates through skeletal evidence and genetics. The final episode, "God Strikes Back," puts Dawkins face to face with young-earth creationists and intelligent-design advocates, letting their objections run at length before he answers them. Archival readings from Darwin's letters and notebooks appear throughout, alongside interviews with biologists defending the modern evolutionary synthesis. Dawkins never hides his own position, but the series spends most of its time on the mechanics of evolution itself, gene variation, competition, and inheritance, rather than on debate theatrics.