Episode 1: A New Hope (Jul/23/2012)
With the destruction of Warehouse 13 and the death of three of their friends, the only hope left for Myka, Pete, Claudia, and Artie is to recover an obscure artifact which may not even exist... and which could have deadly consequences when they use it for personal gain.
Episode 2: An Evil Within (Jul/30/2012)
The Warehouse agents go after an artifact that causes persons to hallucinate and riot.
Episode 3: Personal Effects (Aug/06/2012)
Pete and Myka require the rest of the team when they have to track down the remaining artifacts from Sykes' arsenal.
Episode 4: There's Always A Downside (Aug/13/2012)
The team suspect that an artifact is involved at the prep school where Hugo Miller's nephew attends. While Pete and Claudia check out the prep school, Myka and Steve track down another artifact in New Orleans.
Episode 5: No Pain, No Gain (Aug/20/2012)
While Artie and Steve investigate the theft of artifacts from the warehouse, Mrs. Frederic invites Claudia to lunch and Pete and Myka investigate a miraculously-healed athlete.
Episode 6: Fractures (Aug/27/2012)
An artifact from a previous case, Lewis Carroll's mirror, turns up missing from storage and the team set out to recover it.
Episode 7: Endless Wonder (Sep/10/2012)
Steve, Artie, and Claudia take try to find where Brother Adrian has been hiding. Meanwhile, a powerful company executive may have created a new artifact-related drug with the ability to increase people's height, and Myka and Pete must try and stop it.
Episode 8: Second Chance (Sep/17/2012)
While Pete and Myka try to track down an artifact that causes people to rust to death, Steve and Claudia try to find a way to cut him off from the metronome artifact that is keeping him alive.
Episode 9: The Ones You Love (Sep/24/2012)
While Brother Adrian ramps up his campaign against Artie by targeting the teams' loved ones, Steve and Mrs. Frederic discover the reasno behind the Brotherhood's attacks.
Episode 10: We All Fall Down (Oct/01/2012)
After discovering the truth about their situation, the agents gather at the warehouse and set out to find the person responsible for the warehouse thefts and the attacks on their loved ones... before the responsible party endangers the world.
Episode 11: The Living And The Dead (Apr/29/2013)
With the fate of the world in their hands, Pete and Myka's only hope of finding a cure to the Sweating Sickness is a drunken history professor. Meanwhile, Steven and Claudia enter Artie's subconscious in an attempt to bring him out of his coma before he fades away for good.
Episode 12: Parks and Rehabilitation (May/06/2013)
While Pete and Claudia travel to Oregon to look for an artifact used to kill enemies of the environmental movement, Artie deals with the repercussions of Leena's death.
Episode 13: The Big Snag (May/13/2013)
A mishap with an artifact traps Pete and Myka in a fictional 1940s world where they have to solve a murder to escape... but someone doesn't want them to. Meanwhile, Claudia and Steven convince Artie to go along with them to investigate reports of stolen cars, and Artie starts taking dangerous risks.
Episode 14: The Sky's the Limit (May/20/2013)
While Pete and Myka travel to Las Vegas to investigate two deaths where the people inexplicably fell from great heights, Claudia and Steven investigate two jockeys in London who went into comas after winning their races. Meanwhile, Artie gets a visitor to the warehouse.
Episode 15: Instinct (Jun/03/2013)
H.G. has created a new life for herself in Wisconsin, but calls in the agents when she comes up against an unidentified artifact. Meanwhile, Abigail joins the others on the floor of the warehouse to track down the source of mysterious tremors that threaten to destroy the building.
Episode 16: Runaway (Jun/10/2013)
Pete, Myka, and Steven team up with a U.S. Marshal to track down two prisoners who used a lava-spewing artifact to escape prison. However, they discover that the Marshal is Liam's ex. Meanwhile, Artie and Claudia try to track down part of an artifact that is rendering Artie deaf.
Episode 17: What Matters Most (Jun/17/2013)
Someone in a gated community is using an artifact to extract vengeance and the agents are sent to investigate.
Episode 18: Lost & Found (Jun/24/2013)
The agents track down a cache of artifacts stolen from Warehouse 12 by the infamous Roaring Dan Seavey.
Episode 19: All The Time In The World (Jul/01/2013)
The clock is ticking to track down an evil alchemist who has bronzed Claudia and stolen the only artifact that can reverse the condition, which seems to be affecting Mrs. Frederic and the Warehouse as well.
Episode 20: The Truth Hurts (Jul/08/2013)
Pete and Myka capture Paracelsus but not before he makes himself immortal. When Myka's cancer becomes worse, Pete must make a deal with Paracelsus to cure his partner. Meanwhile, Claudia receives some startling news from Artie.
Source: Tv.com