CW's popular show Supernatural has garnered a dedicated fan base over the years, but it is no secret that the series has had its fair share of disappointing storylines, particularly in the later seasons. While the earlier seasons were a hit with viewers, the show seemed to struggle to maintain the same level of quality as time went on. Let's take a look at some of the most frustrating plotlines that left fans scratching their heads.

10. Demon Dean: At the end of Season 9, Dean was stabbed by Metatron and resurrected as a demon due to the Mark of Cain. Season 10 teased Dean embracing his new identity, but the potential for an intriguing story arc quickly fizzled out after just a few episodes.

9. Crowley Sacrifices Himself for Sam & Dean: Crowley, the King of Hell, was a beloved character known for his wit and complexity. However, his sacrifice to save Sam and Dean felt forced and uninspired, leaving fans disappointed.

8. Abandoning Adam: Adam Milligan, Sam and Dean's half-brother, was introduced in Season 4. Despite being their family, the Winchesters abandoned him in Lucifer's cage, raising questions about their morality as protagonists.

7. Dean Manipulating Castiel: The popular fan ship "Destiel" between Dean and Castiel seemed to be driven by fan service rather than organic storytelling. Dean often manipulated Castiel, leading to a strained and unbalanced dynamic between the two characters.

6. Sam Leaving Dean in Purgatory: When Dean was trapped in Purgatory, Sam inexplicably decided to live a normal life instead of searching for his brother. This choice felt out of character for Sam and left fans puzzled.

5. Lucifer Coming Back Again: Lucifer's constant returns became tiresome for viewers. Even when he claimed to want to be a father to his son, it felt insincere and unnecessary to bring him back yet again.

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