"Supernatural" is continuing its highly interesting and action-packed story revolving around Dean's Mark of Cain curse. Most of season 10 has concentrated on the brothers' quest of finding a cure or a way to separate the curse from Dean. Will the handsome Winchester brothers be able to find a cure before Dean kills his own brother?

In episode 18, the brothers attempted to do just that with the Book of the Damned. Unfortunately, it only threatened to make them cross over to the dark side and Dean is still stuck with the wretched curse. In episode 19 named "The Werther Project", the brothers will be seen making another attempt at ridding Dean of the curse.

Sam learns that a former Men of Letters, Magnus, once designed a magical box, reports CaterMatt. He sets out to find this box in the hopes that it will help his brother. However, what he isn't prepared for is a deadly alarm system that Magnus set in the box. Once he opens the magical box, it triggers the alarm system, putting his and Dean's life in danger. Can the brothers ever catch a break? Looks like they won't.

In a sneak peek video of the upcoming episode, Sam is seen telling Rowena that he will kill Crowley. Now, fans of the series know that Sam killing the King of Hell is an extremely bad idea. It could set a chain of events and may even make Sam the next King of Hell, as per fans' discussion on Reddit, reported by Venture Capital Post.

However, the Mark of Cain curse has dragged on a bit since the plot was introduced at the end of season nine. With only four episodes after "The Werther Project", many viewers would like to see the show to wrap up this story arc by season 10's finale episode.

"Supernatural" airs on Wednesdays at 9 p.m. ET on CW.