The Unbelievers is a documentary film that follows renowned scientists Richard Dawkins and Lawrence Krauss as they travel across the world to spread the message of the importance of science, reason, and rational thinking. The film showcases their lectures and debates with religious leaders, politicians, and other prominent figures, where they discuss the role of science in society and the dangers of religious faith and dogma. The documentary also highlights the personal and professional lives of these two scientists, providing an intimate look into their work and the impact they have on the scientific community. Through their travels, Dawkins and Krauss aim to inspire people to question their beliefs and to embrace reason and evidence-based thinking in order to make the world a more rational and enlightened place. The film features appearances by other notable scientists such as Neil deGrasse Tyson and Bill Nye, as well as interviews with fans and critics of Dawkins and Krauss.