Pete and Myka are sent to investigate a town where the inhabitants' minds are being altered making them act as they please. Meanwhile, Artie is confused by the energy flows going on in the warehouse.

Pete and Myka return to Washington to intercept a samurai sword that is to be presented to the president, and they discover a competitor for items that belong to the warehouse.

Pete and Myka visit a Florida prison to probe a spate of unexplained suicides. Meanwhile, Claudia changes a light bulb with the help of an artifact.

After receiving word that her father is dying, Myka travels home to see her parents.

When an artifact meant for the Warehouse turns up in the small town next door, the team finds themselves in the middle of a B-movie meltdown complete with cowboys, gladiators, sci-fi robots and beach storming marines. Their only chance of survival rests with the man who invented television, Philo T. Farnsworth.

When young super models rapidly age 50 years overnight, Pete and Myka go undercover in the glam world of high fashion to discover who – and what – is behind the transformations.

Douglas Fargo of Eureka's Global Dynamics is sent to Warehouse 13 to help update its aging computer system. This triggers a seemingly sentient computer virus that sends the Warehouse into lockdown and traps the team inside.

When a series of mysterious disintegration deaths occur in Pittsburgh, the team discovers that the artifact responsible, Joshua's Horn, has ties to Helena's time as an agent in 1893.

While Pete and his mother Jane try to determine the origins of their mysterious opponents, Myka and Claudia travel to Portland to stop a girl who can apparently vaporize anyone she hates with blasts of radiation.

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.

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.

Pete, Myka, and Charlotte must track down Sutton, the only man who knows where they can find Paracelsus and exchange the Philosopher's Stone for the stele that will free Claudia from her bronze imprisonment... before she disintegrates.

When Paracelsus takes control of Warehouse 13, it proves to only be the first step in his plan to recreate the entire world in his image. To stop him, Pete and Myka must follow him back through time to 1541 and prevent him from killing the Regents and becoming the permanent master of the Warehouses.

Pete's former girlfriend Kelly Hernandez asks him to help her find her missing grandmother, and the trail leads into a cancelled telenovela. Meanwhile, Artie forces Claudia to go with Steve to investigate the case of a college student of whose spine broke in the middle of a classroom presentation.