The Biggest Secret: The Book That Will Change the World (1999) by David Icke is a foundational text of modern conspiracy culture that posits a global, interdimensional conspiracy managed by a reptilian-human hybrid race. Icke argues that humanity is enslaved in a mental and emotional prison designed to harvest negative energy, particularly fear, to feed these entities. The book is characterized as an "encyclopedic amalgam" of conspiracy theories and new-age philosophy, often criticized for lacking conventional evidence but regarded as a highly influential text in alternative media circles.