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• S4.E1 ∙ Mission to Mars
• S4.E2 ∙ Hunting White Holes
• S4.E3 ∙ Mystery of the Milky Way
• S4.E4 ∙ Jupiter: Secrets of the Solar System
• S4.E5 ∙ Secrets of the Asteroids
• S4.E6 ∙ Inside Space's Great Wall
• S4.E7 ∙ Mystery of the Dead Planets
• S4.E8 ∙ Mystery of the Giant Ice Planets