is the title of the third episode of the fifth season (S5E3) of the television series Supernatural .

The episode explores the conflict between a character's deepest desires ("what is") and the reality of their responsibility ("what should never be").

Dean eventually realizes that his "perfect" life is an illusion maintained at the cost of the people he would have saved in the real world.

In this episode, Dean Winchester is attacked by a Djinn and transported into an alternate reality where his mother is still alive and he leads a "normal" life—free from hunting.

The title is a direct reference to the Led Zeppelin song of the same name from their 1969 album, Led Zeppelin II . The song was written by Jimmy Page and Robert Plant and is known for its shifting dynamics between quiet, melodic verses and heavy, driving choruses. Episode Overview: Supernatural S5E3

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