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- Season 4 overviewJul 23, 2012-Jul 8, 201320 episodesSeason 4 episodes1. A New Hope Jul 23, 2012
- The team's only hope is racing to the other side of the Earth to hunt down a dangerous artifact.
- 2. An Evil Within Jul 30, 2012
- Pete and Myka investigate a mysterious case where mobs of angry people are hallucinating.
- 3. Personal Effects Aug 6, 2012
- All hands are on deck to prevent a small town from being wiped off the map.
- 4. There's Always a Downside Aug 13, 2012
- Pete and Claudia reunite with Hugo to track down a deadly artifact at his nephew's prep school.
- 5. No Pain, No Gain Aug 20, 2012
- Pete and Myka investigate a hockey player who is miraculously recovering from his injuries.
- 6. Fractures Aug 27, 2012
- The team discovers someone has stolen Lewis Carroll's mirror from the warehouse.
- 7. Endless Wonder Sep 10, 2012
- Pete and Myka cross paths with an inquisitive drug company exec; a pill is making people taller.
- 8. Second Chances Sep 17, 2012
- Pete investigates a case of people rusting away; Artie tells the truth about Brother Adrian.
- 9. The Ones You Love Sep 24, 2012
- Brother Adrian sends deadly artifacts to the agents' loved ones.
- 10. We All Fall Down Oct 1, 2012
- Artie tries to release a deadly virus that could wipe out half the world's population.
- 11. The Living and the Dead Apr 29, 2013
- Pete and Myka race to stop a global plague before it kills half the world's population.
- 12. Parks and Rehabilitation May 6, 2013
- Pete and Claudia investigate a series of earthquake-related accidents.
- 13. The Big Snag May 13, 2013
- Pete and Myka are transported into a crime novel.
- 14. The Sky's the Limit May 20, 2013
- Mrs. Frederic introduces Artie to Abigail Chow, the new B&B manager.
- 15. Instinct Jun 3, 2013
- HG Wells contacts Pete and Myka out of the blue to give them a tip.
- 16. Runaway Jun 10, 2013
- Pete, Myka and Steve must partner with a U.S. Marshal to track down fugitives.
- 17. What Matters Most Jun 17, 2013
- Residents of a posh gated community begin to be affected by a mysterious, versatile artifact.
- 18. Lost & Found Jun 24, 2013
- A lead on a cache of artifacts stolen from Warehouse 12 by the infamous pirate, Roaring Dan Seavey.
- 19. All the Time in the World Jul 1, 2013
- An evil alchemist has bronzed Claudia and stolen the only artifact that can reverse the process.
- 20. The Truth Hurts Jul 8, 2013
- The evil alchemist Paracelsus is on the run and must be stopped before he achieves immortality.