Kevin McHale, Naya Rivera, Mark Salling, Heather Morris, Neil Patrick Harris, Lea Michele, Chris Colfer, Dianna Agron, Harry Shum Jr., Dijon Talton, Cory Monteith, Jenna Ushkowitz and Matthew Morrison Photo

From: Photo Flash: First Look at Neil Patrick Harris on GLEE

In an episode directed by Emmy Award winner Joss Whedon, Mr. Schuester's former high school nemesis (Neil Patrick Harris) causes trouble for the glee club. Rachel struggles with a life-long personal issue, and Artie's dreams take him on an adventure. Additional guest stars include Molly Shannon, Idina Menzel and Jonathan Groff.