Bones Bones

In case you hadn't heard, Bones will welcome a new character to the fold when the show returns Monday.

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But the happy couple will first have to deal with the return of spooky killer Christopher Pellant (Andrew Leeds), who Nathan says will "scare the crap" out of the audience in this season's finale cliff-hanger.

"He will change the course of the series for a little bit," Nathan says. "It's going to put [Booth and Brennan] in a completely different situation than they've been in before professionally. And that will affect them personally to a large, large extent."

Bones airs Mondays at 8/7c on Fox.

(Additional reporting by Kate Stanhope)