| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | The Mystery of Plants |
October 2, 2005
TLC
|
30 | |
| S04E02 | The Mystery of Water |
October 6, 2005
TLC
|
30 | |
| S04E03 | The Mystery of Weather |
October 9, 2005
TLC
|
30 | |
| S04E04 | The Mystery of Size and Shape |
October 16, 2005
TLC
|
30 | |
| S04E05 | The Mystery of Flight |
October 23, 2005
TLC
|
30 | |
| S04E06 | The Mystery of the Five Senses |
October 30, 2005
TLC
|
30 | |
| S04E07 | The Mystery of Bugs |
November 13, 2005
TLC
|
30 | |
| S04E08 | The Mystery of Stars and Planets |
November 20, 2005
TLC
|
30 | |
| S04E09 | The Mystery of Dinosaurs |
November 27, 2005
TLC
|
30 | |
| S04E10 |
The Mystery of Time
series finale
|
December 4, 2005
TLC
|
30 |
No artwork of this type.
No artwork of this type.
No artwork of this type.