Castiel plays a vital role on next week's return episode of Supernatural.

But will the return be triumphant? Or untrustworthy?

That's what Sam and Dean debate in the following clip from "Goodbye Stranger," as their angelic friend explains to them Crawley's dangerous plan. Watch now:

Elsewhere on this Supernatural Season 8 installment, the trio learns that their enemy has been torturing Rachel Miner's Meg, who also makes an appearance, heading off with Sam to stave Crowley off while Dean and Castiel go searching for Lucifer's Crypt.

Supernatural airs "Goodbye Stranger" on Wednesday, March 20 at 8/7c and TV Fanatic will post our weekly recap and review soon after the episode airs.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.