Entertainment Weekly's Michael Ausiello is reporting that Seth Green, who played Oz on Buffy and currently is one of the brains behind Robot Chicken, is joining NBC's Heroes this season. He'll have a multi-episode storyline with fellow Robot Chicken-er Breckin Meyer. They'll play two comic-book aficionados who cross paths with one of the heroes, though it's not certain right now which of the heroes they'll interact with, in what way, or what their character names are going to be.

source: TV Squad