"Supernatural" season 10 is two episodes away from its conclusion and the things about to ensue are nothing short of intense. The penultimate episode of the series titled "The Prisoner" promises trouble for the Winchester brothers and it involves the Stynes. 

When it comes to this trouble-making family, Dean knows no bounds in putting them and their evil ways to rest. The synopsis for the episode suggests that the hunter sets aside the rules and does not think twice in taking matters into his own hands. Simply put, Dean is on a rampage and this itself spells trouble. 

Wherever that leads him, good, bad or worse, remains to be seen but one thing's for sure. A showdown with a Styne is never easy. Fans have seen the brothers struggle with that. A rampaging Dean does not sound comforting either as this may cost him, making him reckless with a whole lot more horrible possible outcomes, so this will be exciting to see. 

Meanwhile, this episode will also show Sam dealing with his decision. In his ongoing fight to get the Mark of Cain out of his beloved brother's system, the hunter promised Rowena that he would kill the King of Hell. Crowley is very much alive in the promo but the scene that shows Dean pointing a gun at someone is the one that worries fans. 

While fans know of Sam's plans to kill Crowley, they are struck by nothing but worry. The idea is downright outrageous and even if Sam is actually successful in doing it, it would make things worse for him and his brother. 

So what horrors await these bold gentlemen? The spoiler for the "Supernatural" season 10 finale "My Brother's Keeper" reveals that Dean's decision involving the Mark of Cain will change their lives forever.

Episode 22 airs on May 13, while the finale airs on May 20.