Photos and Audio: Tonight on GLEE- the New Directions Take on GREASE!

On tonight's episode of GLEE, titled, 'Glease,' Rachel and Kurt pay a visit to Lima as the glee club launches its production of "Grease." Meanwhile, Cassandra July returns to shake things up in Rachel's life, and Santana comes back to lend a helping hand. Check out photos and full tracks from the episode below!

GLEE is a musical comedy about a group of eager and ambitious students who strive to outshine their singing competition to win Nationals while navigating the cruel halls of McKinley High. Since its debut, GLEE has become a bona fide cultural phenomenon, received prestigious honors including the Golden Globe and Peabody Award and singlehandedly made glee clubs cool again.

In addition to the regular cast, GLEE has featured guest appearances by a wide range of talented performers, including Gwyneth Paltrow (who won the 2011 Emmy Award for Outstanding Guest Actress in a Comedy Series), Carol Burnett, Kathy Griffin, Cheyenne Jackson, John Stamos, Britney Spears, Kristin Chenoweth, Idina Menzel, Jonathan Groff, Molly Shannon, Olivia Newton-John and Neil Patrick Harris, who won a 2010 Emmy Award for Outstanding Guest Actor in a Comedy Series for his work on the show.