Paracelsus takes control of Warehouse 13 and uses his newfound abilities to terrorize the team... and then travel back in time to create a new timeline where he rules the Warehouse.

Pete and Steve are sent to a Renaissance Faire to search for an artefact that's making horseless chariots and life-size chess pieces come to life, while Claudia's desperate attempt (with Myka's help) to remove the effects of the music box artefact from her sister in order to revive her have unintended consequences.