<P> At the end of the third season of Supernatural , main character Dean Winchester is in Hell after being killed by the hellhounds of the demonic antagonist Lilith . In the season four premiere `` Lazarus Rising '' , the angel Castiel is introduced as the one who brought Dean back from Hell and resurrected him . Because merely perceiving his actual form typically results in blindness , he takes a human host -- James `` Jimmy '' Novak , a `` devout man '' who prayed for it -- to communicate with Dean , and tells him that he has been brought back because God has work for him . Lilith is breaking the 66 seals in order to free Lucifer , and Dean must stop her . </P>
<P> At the end of the third season of Supernatural , main character Dean Winchester is in Hell after being killed by the hellhounds of the demonic antagonist Lilith . In the season four premiere `` Lazarus Rising '' , the angel Castiel is introduced as the one who brought Dean back from Hell and resurrected him . Because merely perceiving his actual form typically results in blindness , he takes a human host -- James `` Jimmy '' Novak , a `` devout man '' who prayed for it -- to communicate with Dean , and tells him that he has been brought back because God has work for him . Lilith is breaking the 66 seals in order to free Lucifer , and Dean must stop her . </P>
what episode do dean and sam meet castiel
what episode do dean and sam meet castiel
`` Lazarus Rising ''
`` Lazarus Rising ''