'Supernatural': Jensen Ackles Sings & Christian Kane Guest Stars (PHOTOS)

It's time for Dean (Jensen Ackles) to sing once again.

In the December 5 episode of Supernatural, Dean goes off on his own to take a case, which reunites him with an old friend and former hunter, Leo Webb, played by guest star Christian Kane.

Behind the Scenes of the 'Supernatural' Cover Shoot With the Guys (PHOTOS)

Check out some candid shots of Jared, Jensen, Misha, and Alexander as we celebrate the long-running series' final season.

"The two have a wild night out," executive producer Andrew Dabb told TV Insider.

Also in "Last Call," Castiel (Misha Collins) has an idea of how he can help Sam (Jared Padalecki) find God.

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Plus, the actor shares how his 'Supernatural' and 'SEAL Team' characters would handle each other's lives.

Click through the gallery above for a look at Dean taking the stage with Leo and Eileen (Shoshannah Stern) and Castiel with Sam.

Supernatural, Thursdays, 8/7c, The CW