Crossover: Supernatural: One Year Gone

Monster hunter Dean Winchester, despite being supposedly retired, travels to Salem, Massachusetts to retrieve a copy of the Necronomicon, which he believes contains a spell that can release his brother Sam from Hell. This tie to the Cthulhu Mythos is one of several crossovers confirming that the events of the TV series Supernatural take place in the CU. It is also hinted that a similar book encountered by the brothers in the episode “Swap Meat” was a watered-down version of the Necronomicon.