Supernatural - Zur Hölle mit dem Bösen The Devil You Know (2005– ) Online
Dean and Sam are heading east in their Impala tracking down a swine flu outbreak. Out of the blue, the cunning demon Crowley appears in their car and offers to help them to find the last two Horsemen to get their rings. Crowley explains to the reluctant brothers that he wants Lucifer trapped and he knows a demon that can tell the location of Pestilence. Dean heads with Crowley to the Niveus Pharmaceuticals, and they abduct the demon Brady, who had studied with Sam and was his friend. Crowley unsuccessfully interrogates Brady; however, when they hear a hell hound howling, the demon Brady changes his attitude and gives the location of the Pestilence.
| Episode cast overview: | |||
 | Jared Padalecki | - | Sam Winchester |
 | Jensen Ackles | - | Dean Winchester |
 | Jim Beaver | - | Bobby Singer |
 | Mark Sheppard | - | Crowley (as Mark A. Sheppard) |
 | Eric Johnson | - | Brady |
 | Carmen Moore | - | Doctor |
 | Stephen Park | - | Mitchell |
| William J. Phillips | - | Convenience Store Clerk (as William Phillips) |
 | Mark Ghanimé | - | Dr. Drake (as Mark Ghanime) |
 | Chris Shields | - | Dr. Keller |
 | Rocky Anderson | - | Janitor Demon |
In the opening scene in the pharmaceutical lab, there is a sign for Herpexia on the wall. This is the fictional herpes drug Sam was forced to act in a commercial for in the earlier episode, Supernatural: Changing Channels (2009).
Both Jensen Ackles and guest star Eric Johnson have had a starring role on Smallville (2001), but in different seasons. Jensen was once considered for the role of Clark Kent before Tom Welling was eventually cast. Coincidentally, both played the love interest of Lana Lang.
Many Supernatural episodes share a title with a Rock or Metal song. "The Devil You Know" is one of these, with the small exception that it is the title of the album released by Heaven & Hell in April of 2009. Interestingly, Heaven & Hell vocalist Ronnie James Dio passed away merely 17 days after this episode's premiere.
When Crowley was telling Brady that if Lucifer wins he would kill all the demons he said "when the Morningstar cleans house, we all get the mop." Lucifer's name literally means "bringer of light" (or "bringer of dawn" depending on different texts). In Latin the word "Lucifer" was also used as the name for the morning star, the first star seen in the morning (which is actually the planet Venus). So "Morningstar" became a kind of nickname for Lucifer/Satan.
Eric Johnson plays a character named Brady. Oddly, Jensen Ackles used to play a character named Eric Brady on "Days of Our Lives."
The Latin incantation that Brady uses to contact Pestilence: "dis manibus praeest praesens obtine mihi dominum pestilentiarum omnium" translates to "of all the present to hold fast to me, is presided over by the lord of the pestilences, the hands of the gods."
This is the first episode in which Crowley calls Sam "Moose"
Right after the fight between the two hellhounds there are bloodstains in the clear glass of the camera that move with it.
Body count: 5 (lab technician, Mitchell, the two Niveus security guards, and Brady)