Sebastian Roche will appear on multiple networks this fall.

The actor, who will reprise his shape-shifting role on Fringe, has just been cast on an October episode of Supernatural.

According to producer Sera Gamble, Roche will appear on the installment titled "The Third Man" as an angelic friend of Castiel's named Balthazar.

“Remember when Cass was dragged back to Heaven as a prisoner? Balthazar was actually the only friend who stood up for him,” Gamble told Fancast. “During the Apocalypse, Balthazar went AWOL, and Cass thought he was dead. Turns out...not so much.”

What will this character be up to? Gamble would only say he'll be doing "interesting, shady stuff we’ve never seen an angel do before."

Remember: Supernatural moves to Fridays for season six and premieres on September 24.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.