Dianna Agron Returning to ‘Glee’Dianna Agron Returning to ‘Glee’It's in like Quinn! After being noticeably absent for much of Season 5 of 'Glee,' including the Cory Monteith tribute episode, Dianna Agron will return to the series as Quinn Fabray for the 100th episode.Amy SciarrettoAmy Sciarretto