Once Upon a Time season 5
Emma and Hook in Once Upon A Time season 5 ABC

Once Upon A Time season 5 returns with its winter finale episode on 6 December where the Dark Ones prepare to obliterate light magic forever. Episode 11 is titled Swan Song and will feature a final face off between Emma Swan and Dark Hook.

Click here to watch the episode via live stream on ABC, or click here to watch it online on ABC's official website in the US. The official synopsis reads as follows:

The last episode ended with Hook bringing back all the Dark Ones from the underworld. He is planning to get his revenge by snuffing out all the light magic from Storybrooke. Actor Colin O'Donoghue dishes on Dark Hook's plan in an interview with TV Line.

Speaking about the Dark One's plan, O'Donoghue said, "That's part of Hook's end game too, because he is the Darkness, they all exist as one in whoever is the conduit. When we see Nimue talking to Merlin in the last episode, she appears to Merlin but she's still a part of Hook."

"Now, bringing [the Dark Ones] back from the Underworld, they exist as separate entities but their overriding mission is to snuff out the light. Hook is willing to do that as well — and if he gets his revenge, that's an added bonus!" he added.

Once Upon a Time season 5 winter finale
Hook with his father (played by Adam Croasdell) in Once Upon A Time season 5 winter finale ABC

The actor also dished on flashback scenes between Hook and his father in the OUAT season 5 winter finale episode. Colin said, "You get to see a bit of Hook's relationship with his father (played by EastEnders' Adam Croasdell), which I was really excited to explore. That time was a huge part of what made Killian Jones become who he was."

"There is some with a kid (played by Salem's Oliver Bell), but you also get to see a little bit of older Killian Jones, played by me, interacting with "Papa Hook," as the fans are calling him," he added.