From Fox: Newcomer Chord Overstreet (“iCarly”) joins the ranks at McKinley as a high school athlete who starts off as Finn’s protégé but becomes his competition. Overstreet has been cast in the recurring role of SAM, and will make his debut in the season premiere episode of GLEE airing Tuesday, Sept. 21 (8:00-9:00 PM ET/PT) on FOX.
As previously announced, other notable guest stars in the sophomore season include singing sensation Charice, who comes to McKinley as an exchange student and becomes a formidable rival to one of the glee club’s stars; and heartthrob John Stamos, who plays a dentist and potential love interest for EMMA PILLSBURY (Jayma Mays). (end announcement)
Don't know much about Overstreet, and his "iCarly" credit appears to be one episode. But I didn't know much about the original "Glee" students either before the show began.