You know him as:
Stiles, the very best part of MTV's "Teen Wolf." He's the sidekick who doesn't get the girl and doesn't get to play lacrosse and doesn't take his shirt off, but his scenes with his BFF-turned-werewolf, Scott (Tyler Posey), elevate the series immeasurably.
Why we like him:
Plucked out of obscurity thanks to his penchant for making silly YouTube videos, O'Brien has a comedic timing and a knack for dialogue that we haven't seen since Seth Cohen on "The O.C." (If you knew us, you'd understand that this is basically the highest compliment we could possibly pay a person.) He's sharp and funny, and when the story calls for it -- as it did in the emotional Season 1 finale -- he's absolutely heartbreaking. And yet, he's the tiniest little person on the Sunset Boulevard billboards. Can we get him front-and-center, please?
Where else you've seen him:
On YouTube? You'll soon be able to catch his lead role in the film "The First Time" with Britt Robertson, opening at Sundance.
-- Carina Adly MacKenzie, Zap2it