Photos: Glee May 18

FOX - 'Dream On' airs Tuesday, May 18 (9:00-10:00 PM ET/PT) on FOX. 

In an episode directed by Emmy Award winner Joss Whedon (Buffy the Vampire Slayer, Angel, Firefly, Serenity, Dr. Horrible's Sing-Along Blog, Dollhouse), Mr. Schuester’s former high school nemesis, Bryan Ryan (guest star Harris), causes trouble for the glee club. Meanwhile, Rachel struggles with a life-long personal issue, and Artie’s dreams take him on an adventure.  

Cast: Matthew Morrison as Will Schuester; Jessalyn Gilsig as Terri Schuester; Jane Lynch as Sue Sylvester; Lea Michele as Rachel Berry; Cory Monteith as Finn Hudson; Jayma Mays as Emma Pillsbury; Dianna Agron as Quinn; Chris Colfer as Kurt; Kevin McHale as Artie; Amber Riley as Mercedes; Mark Salling as Puck; Jenna Ushkowitz as Tina  

Guest Cast: Naya Rivera as Santana Lopez; Heather Morris as Brittany; Dijon Talton as Matt Rutherford; Harry Shum as Mike Chang; Neil Patrick Harris as Bryan Ryan; Molly Shannon as Brenda Castle; Jonathan Groff as Jesse St. James; Idina Menzel as Shelby; Stephen Tobolowski as Sandy Ryerson  

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