Slumber Party is the 4th episode of Season 9. It aired on October 29, 2013.
FELICIA DAY RETURNS AS CHARLIE. SAM, DEAN AND CHARLIE MEET DOROTHY FROM OZ - Sam (Jared Padalecki) and Dean (Jensen Ackles) discover that the table in the Men of Letters bunker - the one that "lit up like a Christmas Tree" when the angels fell in "Sacrifice" (Season 8, Episode 23) - has an ancient computer attached to it. They figure if they can get the computer on, they can track the angels. Who better to call for help than the best IT girl there is, Charlie Bradbury (guest star Felicia Day). While moving the massive computer, they dislodge a jar of fluid on a shelf that unleashes a magical green-webbed wall. Sam and Dean break through it and discover the one and only Dorothy (guest star Tiio Horn) from Oz. She had trapped herself and the wicked witch (guest star Maya Massar) in the web years ago to stop the witch from finding the key that would open the gate that connected their world with Oz. With the wall broken, a massive and magical fight ensues that threatens to destroy the Men of Letters bunker.
In 1935, two men named James Haggerty and Peter Jenkins enter the Men of Letters base, quickly finding themselves bored with the uneventful Men of Letters lifestyle over the next few months. At long last, a famed girl named Dorothy arrives looking for help to kill a witch, while back in the present, Sam presses Crowley to deliver the names of more demons. Dean brings back a Game of Thrones DVD for a slumber party of sorts, while Sam busies himself with rigging the ancient Men of Letters computer to help track angels.
After knocking over a mysterious bottle in the process of trying to fix the computer, Dean brings back Charlie for her expertise in decoding the ancient machine. Charlie reveals that she has experimented with hunting on her own, but finds the experience less magical and filled with the fantasy she'd prefer. While the group watches Game of Thrones and awaits the files to transfer to Charlie's computer, Dean notes how Sam has yet to come to consider the base a home, and the mysterious bottle downstairs uncorks itself and begins forming a webbing on the wall behind it.
Back in the past, Dorothy presents a captive Wicked Witch that she's been unable to kill, though the witch soon breaks free and possesses Jenkins, forcing Haggerty to kill him, while Dorothy flees to create a spell against the witch. Meanwhile in the present, the trio returns downstairs to find the bottle created a hole in the wall, out from which tumbles Dorothy. Once Dorothy acclimates to her present situation, revealing herself to indeed be the Dorothy from the Wizard of Oz books, the time-traveler explains how she trapped the witch in the bottle with her for years, though both have now clearly escaped.
Dorothy explains that the witch has been seeking something within the Men of Letters base, for which Sam and Dean leave to find the wicked witch. While Charlie fan-girls, Dorothy admits her father, L. Frank Baum, got the mythology all wrong in writing his books, though Charlie reasons she could at least rig up some poppy seed bullets that would stun the witch. Upstairs, Sam and Dean find that the witch visited with Crowley, revealing that she intends to find a key hidden somewhere within the base.
Sam and Dean find Charlie and Dorothy in the kitchen, while Dorothy explains that the key would open the portal to Oz (here part of Avalon), returning the witch to her armies. Dean remembers that he found the key during an earlier inventory of the base, and kept it in his room. Sam and Dorothy explore the base looking for the witch, while Charlie and Dean search his bedroom. Dean finds the key, though the witch appears and lobs a blast at Dean that Charlie jumps in front of.
Dean finds the blast to have killed Charlie, though when Sam enters the room, Dean quickly urges Ezekiel to take over and return Charlie to life. Ezekiel warns that fighting the witch would prove a better use of his power than reviving the girl, though he ultimately acquiesces and brings Charlie back to life. Sam regains consciousness, swearing he heard Dean call him "Zeke," while Dorothy reveals to Charlie that she actually died, rather than lose consciousness as Dean had told her. Sam and Dean continue to search the base, Dean taking the opportunity to remind Sam he should consider the base a home.
Dorothy explains to Charlie how her father created the stories as a revisionist history of sorts, though Charlie quickly points out that they seem to provide clues for Dorothy, giving the latter an idea. Meanwhile, the witch gets the drop on Sam and Dean, possessing them both as she sets about opening a portal to Oz and trying to call forth her Flying Monkeys army. Charlie and Dorothy arrive to the Men of Letters garage, retrieving the two ruby slippers from Dorothy's old motorcycle with intent to use the heels to kill the witch, before the possessed Sam and Dean appear. Both boys manage to overpower the girls, but Charlie manages to incapacitate Dean by kicking his groin. Dorothy tries to take on both the guys, but fails.
Charlie finds the witch in the midst of her spell, stabbing with the shoes to finally kill the wicked woman and seal the portal before any flying monkeys get through. With the threat abated and the key in possession, Dorothy opts to return to Oz, inviting Charlie along with her for the adventure. Charlie accepts and says her goodbyes, promising to keep Dean's secret about resurrecting her, and the boys watch the two head off down the yellow brick road.
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