Supernatural's season 10 finale will leave Team Free Will in a tighter spot than usual.

'Supernatural' Season 10 Spoilers: 'The Prisoner' Plot Revealed, Dean Goes On A Rampage

Actors for the CW drama have spent the last few weeks hinting that "My Brother's Keeper" and the run up to the finale will be the darkest, most heart wrenching storyline since the season 5 closer, and Misha Collins (Castiel) has cemented these baleful prophecies.

"I think while they all maintain a certain optimism and naïveté, all of the characters on the show are growing increasingly jaded and cynical," Collins told Variety.

'Supernatural' Season 10 Spoilers: EP Previews Winchester's Lies, Jared Padalecki Makes A Shocking Comparison

After 10 seasons of making deals with the devil in order to save each other and humanity, the Winchesters and their wing man will see everything go to hell (not literally we hope) by time the credits roll on episode 23.

"The end of the season is going to be more of the same in that department; the season cliffhanger is not gonna be just a collective sigh of relief," Collins explained. "When the dust settles, everything is gonna be horrible for everybody."

It sounds like this summer's hell-atus will be even more stressful than the last.

Find out more when Supernatural airs Wednesdays at 9 p.m. ET on The CW. Click the video below to see a preview for the series' next episode, "Angel Heart."