Watch 'Glee' Season 4 Episode 21: Who Is Catfishing Ryder? Where And When To Catch 'Wonder-Ful' [ONLINE VIDEO]

Don't miss "Glee"s newest episode Thursday night! "Wonder-ful" will air on FOX at 8 p.m. EST, for an all-new chapter in our favorite choir's lives. You can also catch it from next week on fox.com and Hulu.

With only two episodes left of the season, things at McKinley are heating up. The Glee clubbers will pay tribute to one of the big names in music history -- it's Stevie Wonder week! The task of tackling iconic songs such as "Superstition" or "For Once In My Life" will seem too big for the kids, and some veterans will come to help -- Kurt, Mercedes and Mike will make an appearance in the choir room this week.

This will be the episode of surprises: Blaine surprises Kurt's father, Ryder will make a stunning discovery on his online pal, Brittany will reveal where she is going next. Too much excitment coming up!

Back in New York, Rachel is knee-deep into her audition for "Funny Girl," and will not let anybody stop her ... Lest of all her nemesis, bitter dance teacher Cassandra July.

Can't wait for Thursday? Take a sneak peek below!