Watch Supernatural season 10 episode 17 online: Sam and Castiel reach out to Bobby as Dean's demon side rises

Supernatural season 10 returns with a new episode on 1 April at 9pm on The CW.

Episode 17 is titled Inside Man, where fan favorite character Bobby returns to help the Winchesters.

Click here to watch the episode online on the official CW website.

The official synopsis reads as follows:

Sam (Jared Padalecki) and Castiel (Misha Collins) follow up on a lead about the Mark of Cain. Dean (Jensen Ackles) and Rowena (guest star Ruth Connell) meet, and face off against each other.

A new promo shows Dean in a really bad condition and with black demon eyes.

The video teases a big Rowena-Winchester faceoff, as Castiel reaches out to Bobby in heaven for help with a cure for the Mark of Cain.

Jim Beaver in an interview talks about his character, and says he will return in a heartbeat for season 11.

Beaver told Showbiz Junkies, "I hated getting killed off on Supernatural, but if I hadn't, I wouldn't have been able to do Justified, and I wouldn't have been able to do Guillermo del Toro's new movie. At the same time, every once in a while I get that lovely phone call. They say we need you for a day or two up in Vancouver and go back and I see everybody and it's like the family reunion without the jerks. It's great.

"If they said they're bringing Singer back for all of season 11, I'd be there in a heartbeat. It's such a fun part, it's such wonderful people to work with. I certainly can't complain because every time there's been something that disappointed me, there's been something wonderful that came up to fill in the gap," he added.