Pete finds himself in a dimention where he never existed and his friends have no memory of him.
Sykes unleashes his plan at reclaiming an artifact he once possessed while enacting his revenge on the Warehouse for taking it away from him.
Pete and Myka fight for their lives after an artifact unleasheshes a zombie appocolypse while Claudia chases after Steve.
Pete and his mother explore her past for questions on the new threat facing the Warehouse and Pete's childhood.
After learning about an immenent attack against the Regents, the team must embark on an emergency mission to stop the attack before it's too late.
Pete and Myka hunt down a killer from Myka's past while the rest interrogate a dog who has witnessed a clue to finding an artifact
Claudia and Pete come to Fargo's rescue after he gets trapped in a video game. Meanwhile, Artie and Steve hunt down a killer Van Gogh painting.
Helena returns to help solve a case that she dealt with in the 19th century.
Pete's ex-wife Amanda unknowingly comes in contact with an artifact while visiting Univille before her big day. Claudia and Steve find themselves re-enacting the American Civil War while hunting for an artifact.
Dr. Vanessa Calder and Hugo Miller help Artie and Claudia find a way around a computer virus that can infect humans. Meanwhile, Pete and Myka retrace their steps to find Steve.
Pete and Myka search for an artifact causing people to go insane while Claudia and Steve hunt for Typhoid Mary's knife.