Hosts Robert Lamb and Joe McCormick explore the astronomical phenomenon of Sirius twinkling, explaining how atmospheric scintillation fueled ancient Greek beliefs that the star caused heat and disease. They trace Sirius’s influence in science fiction, from Voltaire to Marvel Comics, before critically examining the "Sirius Mystery" claim that the Dogon people knew of Sirius B via alien contact. The episode debunks this ancient astronaut theory, citing cultural contamination and lack of evidence.