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• S4.E1 ∙ The Time Travel Enigma
• S4.E2 ∙ Mission to the Red Planet
• S4.E3 ∙ Hunt for the edge of the Universe
• S4.E4 ∙ Journey to Alien Earths
• S4.E5 ∙ Wrath of the Black Hole
• S4.E6 ∙ New Race to the Moon
• S4.E7 ∙ Mars: The Next Frontier
• S4.E8 ∙ Secret History of the Juno Mission
• S4.E9 ∙ Mystery of the Northern Lights
• S4.E10 ∙ Pluto's Strange Secrets