Mitch Pileggi is returning to Supernatural as Sam and Dean’s presumed-dead grandpa — and not for some one-off guest stint. As first teased in Ask Ausiello, the X-Files vet will appear in multiple episodes during season 6.

“I’m a longtime fan of Mitch’s work,” gushes executive producer/new showrunner Sera Gamble. “And we all thought he did an amazing job the first time around, so we’re excited he was game to [return].”

What brings Gramps back? “For one thing, he’s a Campbell — from Sam and Dean’s mom’s side of the family,” reminds Gamble, “which, unlike their dad’s, has actually been into hunting for a very long time. There’s a whole side of Sam and Dean’s history that they know nothing about. We’ll get to find out a bit about it this season.”

In other Supe news, the show is on the prowl for an actor in his late 30s to mid-40s to play the recurring role of Christian. Described as “capable, calm under pressure, and very good at his job,” Christian has a special relationship with Sam and Dean. (Source)