Mitch Pileggi by Todd Williamson/ WireImage.com Mitch Pileggi by Todd Williamson/ WireImage.com
X-Files vet Mitch Pileggi, who may (or may not) have just appeared in the series' latest movie, already has a new gig lined up for fall - as a guest on

Supernatural. Speaking at the raucous Supernatural panel at Comic-Con, series creator Eric Kripke offered some scoop for the ravenous audience when pressed about upcoming guests. Pileggi will be appearing in Season 4 as Mary's father - thus, Sam and Dean's pappy! The panel's other highlights included the surprise arrival of the two Ghost Facers and a sneak peek of the first five minutes of Season 4. The Ghost guys - who just might get their own mini spin-off - treated us to their special song and cracked the audience up when Jensen Ackles escorted them off stage. The session was much less spoilery and playful than than that of Smallville, and Kripke was far more cryptic about what's to come than might suit his loyal fans. But the adoration of Jared Padalecki and Ackles for their she er gorgeousness was so zealous that the actors couldn't help but fan the flames for a cheering crowd. The panel's closing moments added some laughs as Kripke brought along a bloopers reel that added some levity to the room - and showcased just how awesomely goofy the show's hunky leads can really be. So, will you be tuning in for the X-factor this coming Supernatural season? - Anna Dimond