• Misha Collins, Jensen Ackles and Jared Padalecki attend the CW's Fan Party to Celebrate the 200th episode of 'Supernatural' on November 3, 2014.

Misha Collins, Jensen Ackles and Jared Padalecki attend the CW's Fan Party to Celebrate the 200th episode of 'Supernatural' on November 3, 2014. (Photo : Getty Images/Alberto E. Rodriguez)

An invisible hellhound will attack at a campsite in "Supernatural" Season 12 episode 15 titled "Somewhere Between Heaven and Hell." This will lead Sam Winchester (Jared Padalecki) and Dean Winchester (Jensen Ackles) to investigate the mysterious circumstances.

In "Supernatural" Season 12 episode 14 titled "The Raid," which aired on March 2, Mary Winchester (Samantha Smith) and the British Men of Letters had a chance to take out a nest of Vampires. However, the alpha-vamp turned the tables on them. 

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In "Somewhere Between Heaven and Hell," Castiel (Misha Collins) will get a lead on Kelly Kline (Courtney Ford). Also, two of the personal demons of Crowley (Mark A. Sheppard) will uncover what he has been hiding.

Joining Padalecki, Ackles, Collins, Ford and Sheppard in "Somewhere Between Heaven and Hell" are Mark Pellegrino as Lucifer, Nathan Mitchell as Kelvin, Paul Piaskowski as Thomas and Marc Senior as Victor. This is the first "Supernatural" episode of Senior, who previously appeared on "24 Hour Rental," "iZombie," "The Whispers" and "Timeless."

"Somewhere Between Heaven and Hell" was written by Davy Perez and directed by Nina Lopez-Corrado. It will air on The CW on March 9, Thursday, at 8:00 p.m.

Sheppard has been played Crowley since 2009 and before joining the cast of "Supernatural," he played Dr. Charles Walker in "Medium," Anthony Anthros in "Bionic Man," Manservant Neville in "The Middleman" and Romo Lampkin in "Battlestar Galactica." He also played Jim Sterling in "Leverage" from 2008 to 2012 and Benedict Valda in "Warehouse 13" from 2009 to 2014.

On the other hand, Ackles and Padalecki have been playing the Winchester brothers in "Supernatural" since 2005. The two actors played Justin Angles and Jaden Jaworski in "Kings of Con" Season 1 episode 10 titled "Arlington, VA," which aired on Jan. 17.

Fans can also expect the Winchester brothers to be back in "Supernatural" Season 13, which is expected to premiere before 2018. There are still no details about the actors who will join Ackles and Padalecki in the main cast.

Watch a video of Padalecki's interview on "Live With Kelly" in 2016 here: