David Icke introduced some wild concepts to the public in the early '90s, and they gained him nothing but ridicule. But in the years since, his theories, which include the idea that the earth and moon are hollow, have caught on with a surprising number of people. Another one of Icke's popular theories includes the belief that shape-shifting lizard people control all societies. According to Icke, these alien lizard people have been around for thousands of years, taking the forms of world leaders and politicians. Icke believes that the majority of the human race is unknowingly enslaved and controlled by these reptilian overlords.