Supernatural's Sam Winchester can't look Charlie in the eyes.

'Supernatural' Season 10 Spoilers: 'My Brother's Keeper' Plot Revealed, What's In Store For The Finale

Charlie (Felicia Day) will come to aid the Winchester's once more during "Dark Dynasty," and she won't be overly pleased when she learns what Sam has been up to. Seasoned as Sam (Jared Padalecki) may be when it comes to going behind Dean's back, a new sneak peek reveals that Padalecki's character is uncomfortable revealing his own deceit to one of the brothers' closest allies.

However, desperate times call for desperate measures - an aphorism that everyone from Charlie to Cas (Misha Collins) will come to believe as season 10 wraps up.

'Supernatural' Season 10 Spoilers: Sam's Savior Actions Prompt 'Dire Decisions' For Dean, Jensen Ackles Explains

"We are all buying into the desperate schemes; they all are not giving up at this stage of the game, and are hell-bent on finding a resolution to Dean's dilemma. And that really becomes a central storyline for the rest of the season, that's what the finale is building towards - we're trying to rescue Dean," Collins explained, according to Variety. "'Come hell or high water' becomes the team mantra. And characteristically, we make deals with the devil and the ends justify the means and enormous sacrifices are made in our efforts to cure Dean."

Watch as these sacrifices and schemes start to unfold in Wednesday's "Dark Dynasty." Click the video below to see a sneak peek.

Find out more when Supernatural airs Wednesdays at 9 p.m. ET on The CW.