David Icke's theories began to take shape in the early 1990s when he started to explore the concept of reptilian aliens. His first major book, "The Biggest Secret," published in 1999, laid the groundwork for his claims, suggesting that a bloodline of reptilian shapeshifters controls the world. Icke argues that these beings have infiltrated key positions of power and influence, manipulating global events to maintain their dominance.
At the heart of Icke's beliefs lies an amalgamation of ancient mythology, secret societies, and modern conspiracy theories. He draws upon various sources, including the Sumerian texts and the works of other conspiracy theorists, to support his assertions. The notion that extraterrestrial beings are among us is not new; however, Icke's unique spin on this idea has garnered significant attention and controversy.