'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.

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"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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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