Returning on July 23, 2012 with a 20 episode order for Season 4, the announcement of Warehouse 13’s renewal was all but expected. Season Five was commissioned, but contained only six episodes, marking the culmination of the series.
- Eddie McClintock as Peter Lattimer (20 episodes)
- Joanne Kelly as Myka Bering (20 episodes)
- Saul Rubinek as Arthur Nielsen (20 episodes)
- Genelle Williams as Leena (13 episodes)
- Allison Scagliotti as Claudia Donovan (20 episodes)
- Aaron Ashmore as Steve Jinks (19 episodes)
- CCH Pounder as Irene Frederic (8 episodes)
- Faran Tahir as Adwin Kosan (6 episodes)
- Brent Spiner as Brother Adrian (6 episodes)
- Kelly Hu as Abigail Cho (5 episodes)
- Jaime Murray as Helena G. Wells (4 episodes)
- Polly Walker as Charlotte Dupres (4 episodes)
- Josh Blaylock as Nick Powell (4 episodes)
- Anthony Stewart Head as Paracelsus (3 episodes)
- James Marsters as Bennett Sutton (3 episodes)
- Kate Mulgrew as Jane Lattimer (2 episodes)
- Lindsay Wagner as Vanessa Calder (2 episodes)
- Rene Auberjonois as Hugo Miller (1 episode)
- Jeffery R. Smith as Mr. Keeler (3 episodes)
- Sasha Rioz as Marcus Diamond (1 episode)
- Anthony Michael Hall as Walter Sykes (1 episode)
- Roger Rees as James MacPherson (1 episode)
|A New Hope||Writer: Jack Kenny||Director: Chris Fisher||July 23, 2012||#1|
|Pete, Myka, Claudia, Leena, and Artie must find a way to restore the Warehouse before it's too late.
|An Evil Within||Writer: Holly Harold||Director: Constantine Makris||July 30, 2012||#2|
|Pete and Myka track down an artifact in Philadelphia that's causing people to see bizarre monsters, while Artie tries to prevent Claudia from bringing back Steve.
|Personal Effects||Writer: Ian Stokes||Director: Andrew Seklir||August 6, 2012||#3|
|The Warehouse team must track down the remainder of Sykes's artifacts which are out loose on a North Dakota city.
|There's Always a Downside||Writer: Drew Z. Greenberg||Director: Constantine Markis||August 13, 2012||#4|
|Pete and Claudia attempt to recover an artifact that fell into Hugo Miller's hands, while Myka and Steve travel to New Orleans to find an artifact that's healing people of their illnesses.
|No Pain, No Gain||Writer: Nell Scovell||Director: Jay Chandrasekhar||August 20, 2012||#5|
|While Pete and Myka investigate a hockey player who's being miraculously healed of his injuries, Steve and Artie look into the thefts occurring within the Warehouse. Mrs Frederic invites Claudia to lunch to show her an incredible revelation.
|Fractures||Writer: Benjamin Raab & Deric A. Hughes||Director: Chris Fisher||August 27, 2012||#6|
|Lewis Carroll's mirror turns up missing and the psychotic Alice Liddell is released into the world once more; the team set out to stop her once and for all.
|Endless Wonder||Writer: Bob Goodman||Director: Michael McMurray||September 10, 2012||#7|
|Artie, Steve and Claudia try to find out where Brother Adrian is hiding. Pete and Myka search for an artifact that is making people taller, with deadly consequences, while a nosy drug executive is tailing them and putting the secret nature of the Warehouse at risk.
|Second Chance||Writer: Diego Gutierrez||Director: Constantine Makris||September 17, 2012||#8|
|Pete and Myka investigate a case of people rusting away, while Steve and Claudia visit Steve's hometown to end his dependence on the metronome. Artie tells the truth about the astrolabe and his connection with Brother Adrian.
|The Ones You Love||Writer: Nell Scovell||Director: Howie Deutch||September 24, 2012||#9|
|Claudia, Myka, and Pete have to protect their families from artifacts, while Artie has some conflicts of his own. Steve and Mrs Frederic look into the brotherhood of the black diamond.
|We All Fall Down||Writer: Holly Harold||Director: Chris Fisher||October 1, 2012||#10|
|Pete, Myka, and Claudia have no time to mourn a fallen comrade as they go after the person responsible. Mrs. Frederic and Steve work with Brother Adrian to find a way to undo the downside of the Astrolabe. Artie's vision of Claudia finally comes true.
|The Living and the Dead||Writer: Drew Z. Greenberg||Director: Millicent Shelton||April 29, 2013||#11|
|Pete and Myka must race to snag an artifact that can reverse the effects of the orchid before it's too late while Claudia and Steve try to bring Artie back before his mind is lost forever.
|Parks and Rehabilitation||Writer: Ian Stokes||Director: Larry Teng||May 6, 2013||#12|
|Pete and Claudia investigate a case of a man being suddenly buried alive in a national park while Artie tries to do Leena's work and Myka and Steve try to help Artie move past all the terrible things he did while he was under the influence of the astrolabe.
|The Big Snag||Writer: John-Paul Nickel||Director: Chris Fisher||May 13, 2013||#13|
|Pete and Myka get sucked into a 1940s detective noir novel in search of an artifact. Meanwhile, Artie, Steve and Claudia chase down a phantom car thief.
|The Sky's the Limit||Writer: Michael Jones-Morales||Director: Jack Kenny||May 20, 2013||#14|
|Pete and Myka head to Vegas to investigate murders that are tied to the world of high magic. Meanwhile, Claudia and Jinks search for an artifact used to rig horse races, while Artie meets the new B&B owner, Abigal Cho.
|Instinct||Writer: Bob Goodman||Director: Jennifer Lynch||June 3, 2013||#15|
|H.G. Wells re-enters the picture to help Pete and Myka with an artifact that's forcing confessions out of criminals. Meanwhile, the rest of the team deals with earthquakes INSIDE the Warehouse.
|Runaway||Writer: Ian D. Maddox & Marque Franklin||Director: Matthew Hastings||June 10, 2013||#16|
|Pete, Myka and Jinks deal with a prison break where the Marshall assigned is Steve's ex-boyfriend. Meanwhile, Artie is struck deaf and Claudia must help him.
|What Matters Most||Writer: Diego Gutierrez||Director: Chris Fisher||June 17, 2013||#17|
|Pete and Myka travel to a gated community in Ohio to investigate a versatile artifact that's killing people. Claudia and Artie investigate a young man spray painting complex mathematical equations on walls in New York City.
|Lost & Found||Writer: Benjamin Raab & Deric A. Hughes||Director: Howie Deutch||June 24, 2013||#18|
|Artie discovers a clue to the location of long lost cache of artifacts stolen from Warehouse 12 by Roaring Dan Seavey. Steve and Claudia are betrayed by Nick. Charlotte DuPrix returns.
|All the Time in the World||Writer: Holly Harold||Director: Chris Fisher||July 1, 2013||#19|
|The warehouse agents have to work against the clock to debronze Claudia and hunt down Paracelsus, Nick, and Sutton.
|The Truth Hurts||Writer: Drew Z. Greenberg||Director: Jack Kenny||July 8, 2013||#20|
|The team continues their attempt to capture Paracelsus before he achieves immortality. Myka seems to be losing her battle with cancer. Steve learns that Artie has been hiding life-changing information from the rest of the team.