'Dream On' would be the episode where Neil Patrick Harris guest stars as William Schuester's old rival and Joss Whedon goes behind the lens to direct.
Next week, "Glee" will present two guests who are expert in their respective fields. Neil Patrick Harris who has numerously shown off his musical skill through some stage productions and the opening number at 2009 Tony Awards, comes on board as Will's former high school nemesis by the name of Bryan Ryan.
Also, Joss Whedon, the acclaimed creator of many sci-fi series such as "Firefly" and "Dollhouse" is assisting behind the lens as director. "There's a terrific episode which Joss Whedon directed which really focuses on Artie's character and focuses on the emotional journey he has to go through being in a wheelchair," producer Brad Falchuk told Zap2It.
"The emotional difficulty and pain, and also triumph of that experience. That's a really beautiful episode I think. It's really fun. And his relationship with Jenna [Ushkowitz, who plays Tina] is also explored a little bit more."
Also in the episode, Rachel struggles with a life-long personal issue, which is finding out her mom. She has been raised by two gay dads. "Dream On" airs May 18.