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• S4.E1 ∙ Lance Armstrong
• S4.E2 ∙ Kareem Abdul-Jabbar
• S4.E3 ∙ Jane Goodall
• S4.E4 ∙ Katie Couric
• S4.E5 ∙ Kevin Smith
• S4.E6 ∙ SciFi Meets National Defense
• S4.E7 ∙ Katy Perry
• S4.E8 ∙ Sylvia Earle, Fabien Cousteau & Adrian Grenier
• S4.E9 ∙ James Cameron
• S4.E10 ∙ Celestial Navigation
• S4.E11 ∙ Salman Rushdie
• S4.E12 ∙ Interstellar Space Travel
• S4.E13 ∙ Alan Alda
• S4.E14 ∙ Stephen Colbert
• S4.E15 ∙ True Story of Hidden Figures
• S4.E16 ∙ Sam Harris and the Science of Belief
• S4.E17 ∙ Frank Oz and the Science of Puppeteering
• S4.E18 ∙ Kelly Slater and the Science of Surfing
• S4.E19 ∙ Astronaut Scott Kelly
• S4.E20 ∙ Stephen Hawking