Glee Adds Broadway Star Andrew Rannells for Series Finale 

Adds Broadway Star Andrew Rannells for Series Finale

Andrew Rannells is set to guest-star on the series finale of Fox musical comedy.

: Even more familiar faces are returning for the finale

, but refused to divulge any details about his character or whether he\'ll sing. However, he and Jimmy Fallon performed an amazing duet to serve as Rannells\' audition tape:

), Rannells also has plenty of experience working with

co-creator Ryan Murphy. He starred on Murphy\'s short-lived NBC comedy

in which he played the showrunner of a successful TV musical series called

In addition to Rannells, Fox revealed Thursday that Geraldo Rivera will be appearing on the finale. You can read a full list of familiar faces returning for the finale here.

s finale airs March 20 on Fox. Who do you think Rannells is playing?

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Photo Credits: Corbis; Frank Ockenfels / AMC; Adam Rose/FOX; Fox; Splash; Eddy Chen/FOX