Heaven for the Climate (Hell for the Company)

It is foretold that the angels will storm Hell to raise the Righteous Man so that he can fight the Devil and save the world. Castiel is doing just that, only he's not a member of the God squad (though his wings would suggest otherwise). Faced with the forces of Heaven and Hell, Castiel throws his lot in with Sam and Dean, but it isn't easy to earn the Winchesters' trust.