It's about time the erstwhile Simon Camden is back on our TV screens. David Gallagher, who starred on The WB's '7th Heaven' for 10 years, will guest star on 'TVD' this season as a werewolf who has a run-in with Klaus in Tennessee. Paying Mystic Falls a visit will be 'Heroes' alum Jack Coleman, as a man with not-so-fuzzy feelings about vampires, and Sebastian Roche, a.k.a. shapeshifter Thomas Jerome Newton from Fox's 'Fringe,' as a vampire hunter who's after Klaus. More trouble for the vampires? What else is new …

'The Vampire Diaries' Season 3 premieres Thurs., Sept. 15, 8PM ET on The CW