This chapter introduces the dominant framing, centred on scientific progressivism and underpinned by an evolutionary framework, which features in contemporary big-budget BBC science documentary series. Introducing the major literature and theoretical concepts on which this book draws, the chapter outlines the books’ approach towards analysing past broadcast media within their historical and institutional contexts. Summarising the books’ main arguments the chapter précis the idea developed across the subsequent chapters, that by analysing science media on evolution, we can understand how progressive and secular humanist narratives became embedded in the normative framings, narrative structures and visual devices used across broadcast genres today.