Sam and Dean discover that the table in the Men of Letters house (the one that lit up like a Christmas Tree when the angels fell), 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 hidden hexbag 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.

Marcus exacts revenge in the worst way; Aidan and Rebecca get close; Sally meets a ghost with a dark side.

Rosen enlists Alpha tech-whiz Skylar Adams (Summer Glau) to help to discover the purpose of an Alpha enhancing technology, but Rosen’s zeal puts both Skylar and her daughter in grave danger.