Episodes: 1.22 Devil's Trap, 2.08 Crossroad Blues, 2.14 Born Under a Bad Sign, 2.22 All Hell Breaks Loose: Part Two, 3.01 The Magnificent Seven, 3.03 Bad Day At Black Rock, 3.04 Sin City, 3.16 No Rest For the Wicked, 4.02 Are You There, God? It's Me, Dean Winchester, 4.04 Metamorphosis, 4.16 On the Head of a Pin, 4.18 The Monster At the End of This Book, 4.21 When the Levee Breaks, 5.01 Sympathy For the Devil, 5.02 Good God, Y'All!, 5.10 Abandon All Hope, 5.13 The Song Remains the Same, 5.17 99 Problems, 5.20 The Devil You Know, 5.22 Swan Song
The devil’s trap is a mystical symbol used to imbolise and control demons, and also to prevent them entering a place, or gaining access to something. The devil’s traps seen in Supernatural all originate from The Lesser Key of Solomon, which is grimoire or magical text written in the 17th century. It contains rituals and spells for invoking and controlling both demons and angels.
There are two major variations of devil's traps in Supernatural:
An example of the Heptagram devil's trap can be seen painted on the ceiling at Bobby's house. It is composed of two pentacles from the Lesser Key of Solomon which form a Heptagram.
Drawn from several shots and scenes. The pentagram devil's trap is seen drawn on the trunk on the Impala as well as in Bobby's Panic Room.
SEASON 3 TITLE CARD
In the opening credits in Season Three, an image of the Devil's trap can be seen.
1.22 DEVIL'S TRAP
2.08 CROSSROAD BLUES
2.14 BORN UNDER A BAD SIGN
2.22 ALL HELL BREAKS LOOSE: PART TWO
3.01 THE MAGNIFICENT SEVEN
3.03 BAD DAY AT BLACK ROCK
There is a devil's trap drawn inside the entrance to John's secret lock-up.
3.04 SIN CITY
Dean draws a devil's trap under a rug in Casey's basement in order to trap her. She is released from it when Father Gil, uses his demonic power to break it.
3.16 NO REST FOR THE WICKED
When Sam summons Ruby to help with Dean's deal, Dean steals her knife and traps her under a devil's trap.
4.02 ARE YOU THERE, GOD? IT'S ME, DEAN WINCHESTER
Bobby, Dean and Sam take refuge in Bobby's Panic Room. It is protected with a devil's trap outside the door, inside on the floor, and in iron under the ventilation fan.
Ruby and Sam use a Devil's trap to restrain a possessed man while Sam uses his power to exorcise the demon. At this point Dean enters, and discovers what Sam is up to.
4.16 ON THE HEAD OF A PIN
Castiel binds Alistair to a Devil's trap which he describes as being old Enochian. So that Alastair will kill Dean and escape, Uriel causes a water leak which drips onto and erases part of the trap, letting Alastair go free.
4.18 THE MONSTER AT THE END OF THIS BOOK
Sam set's a devil's trap for Lilith under a rug.
4.21 WHEN THE LEVEE BREAKS
Sam is held in Bobby's Panic Room, which has a Devil's Trap on the floor. When Castiel releases him, he breaks the traps to make it look as though Sam was freed by demons.
5.01 SYMPATHY FOR THE DEVIL
Zachariah lures Dean and Sam to John's Lock-up, where the devil's trap is again seen.
5.02 GOOD GOD, Y'ALL!
There is a devil's trap inside the door of the church which Ellen steps over.
5.10 ABANDON ALL HOPE
Dean and Sam try and trap Crowley with a devil's trap under a rug.
5.13 THE SONG REMAINS THE SAME
In a house protected against demons with iron fittings and supplies of salt used by the Campbell family there is a devil's trap under a rug.
In 1978, Mary takes her family to a safe house used by the Campbells that has iron fixtures and a devil's trap under the rug.
5.17 99 PROBLEMS
Fearing they are under attack from demons, the people of Blue Earth have taken precautions.
5.20 THE DEVIL YOU KNOW
Brady is tied to a chair placed over a devil's trap, and with a bag with a devil's trap over his head. Crowley also carves a binding link into his chest, so he can't vacate the body.
5.22 SWAN SONG