Why is 'Friday Night Lights'' Adrianne Palicki returning to 'Supernatural'?

Adriannepalicki Sam's long-dead girlfriend is coming back to "Supernatural."

As EW.com first reported, "Friday Night Lights" star Adrianne Palicki will reprise her role as Jess, Sam's love who was killed off in the pilot, for one episode this fall.

But fans are now wondering, why the frick is she coming back? We're guessing it's not going to be good news for Sammy.

Last we saw the Winchester brothers, Lucifer was rising to wreak havoc, and we can't help but think he might have something to do with Jess' return. After all, it was Jess' death that prompted Sam to leave his "normal" life behind and join Dean in the family business. What better way to mess with Sam's head than to have his dead girlfriend appear?

We already saw the damage done to Sam's mental state when the hallucinations of ghosts past confronted him during his detox. Sam's bound to be in a delicate state after that experience, not to mention now knowing that Ruby was playing him all along...

What do you think? Will the Devil have Jess haunt Sam in order to push the poor boy right over the edge?

Or do you suspect Jess is showing up for some other strange purpose?

-Reporting by Marisa Roffman