Warning: This article contains spoilers for the season 12 finale of Supernatural.

The CW

Supernatural's season 12 finale turned into a bloodbath, as the show's heroes tried to take down Lucifer once and for all.

The Winchester brothers saw two allies fall: Castiel (Misha Collins) and Crowley (Mark A Sheppard).

Castiel was seen charging at Lucifer in the alternate reality in a bid to keep him contained while the rift sealed. But upon returning to the original reality, he was unceremoniously stabbed through the back by Lucifer with an angel blade – right in front of a horrified Dean and Sam.

The CW

Misha has been a mainstay on Supernatural since season four. So is he gone for good? Or is there a chance he will be resurrected?

The Castiel actor gave hope to the fans out there, suggesting that he still has a part to play in season 13.

"Cass [or Cas] has a future..." he tweeted.

This content is imported from Twitter. You may be able to find the same content in another format, or you may be able to find more information, at their web site. 2 things, 1) Cass [or Cas] has a future... & 2)if you want to have the most fun possible this summer (while doing good), try this: https://t.co/ci9QUOOTYz — Misha Collins (@mishacollins) May 20, 2017

Supernatural is no stranger to resurrections, of course. Fans have seen Dean and Sam die and come back to life. Dean was even a demon at one point.

So the big question – if Castiel does come back – is how?

The CW

One theory going around is that Jack (aka the son of Lucifer and Kelly Kline) could resurrect Castiel (and maybe even Crowley)... or perhaps there's an alternate reality version of Castiel – just like viewers saw Alternate Bobby Singer.

We'll find out what happens when season 13 begins later this year.

Supernatural returns to The CW this autumn, and fans in the UK can watch the show on E4.

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