Highway to Hell Part 2: The Journey Continues

It's been a year, an entire year without a word from Castiel or Celine Kane. No one knows if she succeeded or survived in killing Lucifer. After signs of the apocalypse scaring Castiel, he brings the gang back together to save Celine and the world. But after a year passing and no word from her are they willing to give up their perfect lives to save The Destroyer.