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has been going for absolutely ages now (it\'s currently on season 14), so you\'d think that the writers would have exhausted all possible plot lines.

But not only have they got plenty in store to see us through this season, and possibly a 15th too, but it seems there\'s one particular storyline that the series\' stars would be interested in revisiting in the future too.

Cast your minds back to season four, when we met Sam and Dean Winchester\'s half brother Adam Milligan (Jake Abel). Adam then returned in season five when he agreed to become Michael\'s vessel before the season ended with Michael, Lucifer and Adam and Sam as their vessels falling into Lucifer\'s Cage.

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Although Sam was eventually rescued, Adam remained trapped with Michael and Lucifer, never to be seen in the show again.

So where\'s Adam at, then – and how is he doing in the cage? That\'s the question that needs to be resolved.

at a red carpet celebrating the show\'s 300th episode. "I\'d like to ask him. Maybe there\'s a white courtesy phone we could pick up and get a straight line to him.

"That\'s something that needs to be touched on, and it might be. But we\'ll have to see."

Related: 7 mistreated TV show characters who were never given a shot, from Supernatural to The Flash

Co-star Jared Padalecki also weighed in, calling it a "great question".

"I\'d do anything for Jake Abel back," he said. "He\'s a dear friend and an amazing actor and an amazing man. I\'ll do anything to work with him again."

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