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• S4.E1 ∙ Trains, Submarines and Zeppelins: Part 1/Part 2
• S4.E2 ∙ What's at the Center of the Earth? Layers! Fossils!
• S4.E3 ∙ What's at the Center of the Earth? Troglobites! Minerals!
• S4.E4 ∙ Junior Conductors Academy Part 1/Junior Conductors Academy Part 2
• S4.E5 ∙ Nest Swap/The Herd Is the Word
• S4.E6 ∙ Stop and Smell the Flowers/Moms' Campout
• S4.E7 ∙ Spooky Tree/Spinosaurus Super Model
• S4.E8 ∙ Where Have All the Lizards Gone?/Conductor's Sleepover
• S4.E9 ∙ Rollin' on the Riverboat: Part One/Rollin' on the Riverboat: Part Two
• S4.E10 ∙ Crystal and King Benefit Concert: Part One/Crystal and King Benefit Concert: Part Two