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Season 4

Paracelsus takes control of Warehouse 13, intent on recreating the entire world in his image. Pete and Myka must follow him back through time to 1541 and prevent him from killing the Regents and becoming the Warehouses' permanent master.

Artifacts:Theodosius of Bithynia's sundial,Karl Schwarzschild's pocket watch,Pierre-Simon Laplace's telescope, arrow ofAchilles,Louis XIV's silverware,Joan of Arc's helmet,Sargon the Great's mirrors,William Bleckwenn's stethoscope,Al Capone's dualTommy guns, stick grenade fromHitler's bunker, African elephant tusk,Black Bart's Cannon, World War IITessen fan,Lewis Carroll's mirror, spine of the Saracen,Chester Moore Hall's achromatic lens,Jack LaLanne's stationary bike,Orville Wright's aviator goggles, H. G. Wells' time machine, TheDuke of Exeter's daughter torture rack spindle, after-image mirror, and the scalpel

Pete and Myka investigate a series of victims drowning and run into a pair of Secret Service agents.

Artifacts: Bronze baby shoes,Alfred Dreyfus' sword hilt,Frances Farmer's music box,Joseph Pilates' resistance bands,Oliver Sacks' record player, silver necklace from theAtacama Desert mines

Pete and Steve search for a dangerous artifact at a Renaissance fair, while Claudia takes a risk to revive her sister from a coma.

Artifacts:Mother Shipton's Cards,Bob Dylan's Bus Pass,Alessandro Volta's pail

Pete, Myka, and Artie try to help Pete's ex-girlfriend Kelly Hernandez when her grandmother gets trapped inside a telenovela. Still, things go awry when they all end up as characters in the soap opera. Meanwhile, a strange accident at a university leads Claudia and Steve to discover an artifact that duplicates its users.

Artifacts: telenovela brooch prop,Edna St. Vincent Millay's two-ended candle,Harvey Korman's cufflinks

Valda tries to move the warehouse to China and uses Claudia's comatose sister Claire as a puppet caretaker. Information on Mrs. Frederic is also revealed - she became the caretaker of Warehouse 13 after her sister was killed in the fire that destroyed the previous Warehouse 13 in 1898.

Artifacts:Sir William Edward Parry's frozen statue,Albert Butz's glasses,Oliver Sacks' record player,Chuck Yeager's copy of Melvin Rixton'sThe Wandering Cowboy record,Charles Atlas's workout trunks,Hiram Abiff's setting maul, The Mason's Compass, The Mason's Square,Julius Wilbrand's buttons, Silly String, Louis XIV's Versailles's Forks. Artifacts are seen during the transfer to WH14: The Washington Monument and The CN Tower from Canada.

The team struggles with the news from Mrs. Fredric that Warehouse 13 will be moving to a new host country at some point in the near future. Meanwhile, they explore a series of flashbacks via King Arthur's Round Table that build into the eternal emotions of the Warehouse itself. Each member contributes their defining moment as an agent, adding to the lore of the Warehouse. Pete and Myka proclaim their love for each other. The series ends in a flashforward decades into the future, showing Claudia as the new Warehouse Caretaker, as she views the defining moments of her long gone friends.

Artifacts:Harriet Tubman's thimble,Jack the Ripper's lantern,King Arthur'sRound Table, marquee for42nd Street from theMark Strand Theatre,Thomas Wedgwood's champagne glass, Louis XIV's silverware forks, Japanese five-tailed fox statue, H.G. Wells' shrink ray,Busby Berkeley's flask, Goodman beggar's tin pan, a clock,Barack Obama's basketball