S04E01 - Trains, Submarines and Zeppelins: Part 1

S04E02 - Trains, Submarines and Zeppelins: Part 2

S04E03 - Rollin' on The Riverboat Part 1

S04E04 - Rollin' on The Riverboat Part 2

S04E05 - Nest Swap

S04E06 - The Herd is The Word

S04E07 - Stop and Smell The Flowers

S04E08 - Moms' Campout

S04E09 - Where Have All The Lizards Gone?

S04E10 - Conductor's Sleepover

S04E11 - Junior Conductors Academy: Part One

S04E12 - Junior Conductors Academy: Part Two

S04E13 - Crystal and King Benefit Concert (1)

S04E14 - Crystal and King Benefit Concert (2)

S04E15 - Spooky Tree

S04E16 - Spinosaurus Super Model

S04E17 - What's at the Center of the Earth? (1): Layers

S04E18 - What's at the Center of the Earth? (2): Fossils

S04E19 - What's at the Center of the Earth? (3): Troglobites

S04E20 - What's at the Center of the Earth? (4): Minerals