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- S4.E1 ∙ Mysterious Ancient Ruins
- S4.E2 ∙ The Mystery of Genius
- S4.E3 ∙ What Lies Below?
- S4.E4 ∙ Secrets of Abandoned Places
- S4.E5 ∙ Acts of God
- S4.E6 ∙ Serial Killer Creatures
- S4.E7 ∙ Mysterious Tombs
- S4.E8 ∙ Uncanny Curses
- S4.E9 ∙ Superhuman Feats
- S4.E10 ∙ Mysteries of the Missing Link
- S4.E11 ∙ Surviving the Impossible
- S4.E12 ∙ The Search for King Arthur
- S4.E13 ∙ Wonders of the Ancient World
- S4.E14 ∙ The Hunt for Jack the Ripper
- S4.E15 ∙ The Search for Extraterrestrial Life
- S4.E16 ∙ Real Life Monsters
- S4.E17 ∙ America's Lost Treasures
- S4.E18 ∙ The Bermuda Triangle and the Beyond
- S4.E19 ∙ Secrets of the Founding Fathers
- S4.E20 ∙ The Weird Wild West
- S4.E21 ∙ Devastating Disasters
- S4.E22 ∙ Mysterious Monoliths
