Deb Stanley (Danielle Nicolet) looks out at Warehouse 13 in amazement. She gets a visit when she follows Pete home on "Endless Wonder"

Steve's mom has a lot to take in after learning of Steve's condition with the metronome. She is played by Laura Innes.

Artie is shocked when Brother Adrian begins sending deadly artifacts to agent's loved ones on Warehouse 13. "The Ones You Love" is the ninth episode of the show's fourth season.

Artie's obsession leads to dangerous consequences on Warehouse 13. "We All Fall Down" is the tenth episode of the show's fourth season.

James Marsters guest stars as a seemingly unreliable professor that Myka and Pete must work with in order to save the world on the Spring return of Warehouse 13. "The Living and the Dead" is the 11th episode of the show's fourth season.

Artie learns that getting back to work won't be as easy as he'd hoped on Warehouse 13. "Parks and Rehabilitation" is the 12th episode of the show's fourth season.

Pet and Myka are transported to a 1940s style movie mystery on Warehouse 13. "The Big Snag" is the 13th episode of the show's fourth season.

Myka and Pete head to Vegas to investigate some crimes connected to magic on Warehouse 13. "The Sky's the Limit" is the 14th episode of the show's fourth season.

H.G. Wells returns to help Pete and Myka on Warehouse 13. "Instinct" is the 15th episode of the show's fourth season.

Claudia ends up on stage on this episode of Warehouse 13. "Runaway" is the 16th episode of the show's fourth season.

Can Artie figure out why a mysterious artifact showed up in a gated community on Warehouse 13? "What Matters Most" is the 17 episode of the show's fourth season.

The team must hunt down artifacts that are stolen on Warehouse 13. "Lost and Found" is the 18th episode of the show's fourth season.