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| Aflevering | Eerste uitzending |
|---|---|
| S04E01 - Mysterious Ancient Ruins | 01/04/2022 |
| S04E02 - The Mystery of Genius | 01/04/2022 |
| S04E03 - What Lies Below? | 08/04/2022 |
| S04E04 - Secrets of Abandoned Places | 15/04/2022 |
| S04E05 - Acts of God | 22/04/2022 |
| S04E06 - Serial Killer Creatures | 06/05/2022 |
| S04E07 - Mysterious Tombs | 13/05/2022 |
| S04E08 - Uncanny Curses | 20/05/2022 |
| S04E09 - Superhuman Feats | 27/05/2022 |
| S04E10 - Mysteries of the Missing Link | 03/06/2022 |
| S04E11 - Surviving the Impossible | 10/06/2022 |
| S04E12 - The Search for King Arthur | 24/06/2022 |
| S04E13 - Wonders of the Ancient World | 07/10/2022 |
| S04E14 - The Hunt For Jack The Ripper | 14/10/2022 |
| S04E15 - The Search for Extraterrestrial Life | 21/10/2022 |
| S04E16 - Real Life Monsters | 28/10/2022 |
| S04E17 - America's Lost Treasures | 04/11/2022 |
| S04E18 - The Bermuda Triangle and the Beyond | 18/11/2022 |
| S04E19 - Secrets of the Founding Fathers | 25/11/2022 |
| S04E20 - The Weird Wild West | 02/12/2022 |
| S04E21 - Devastating Disasters | 09/12/2022 |
| S04E22 - Mysterious Monoliths | 16/12/2022 |