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Tony Award winner Barbra Streisand: Lea Michele (Rachel Berry), who, according to her Twitter account, describes herself as a “Streisand Worshiper,” would likely be more than happy to play the granddaughter of Funny Girl star Streisand. With Idina Menzel as biological mother Shelby Corcoran, it wouldn’t be a stretch for Streisand to play a grandmother on the series. Also, where else would Rachel have inherited the chops for her season one show-stopping sectionals number “Don’t Rain On My Parade”?

	Aaron Tveit

Catch Me If You Can's Aaron Tveit: It is unknown if Will Schuester (Matthew Morrison) has any siblings; he may not speak of his family if he is afraid of the competition. Tveit, who originated the role of Gabe in Broadway's Next to Normal, has also played Link Larkin in Broadway's Hairspray. Since both Morrison and Tveit share the same credit on their resume, a little bit of friendly competition might spark if Tveit showed up as Schuester's younger—and equally talented—brother. Perhaps a new position will open at McKinley or maybe the two will meet at the 2012 regionals.

	Bernadette Peters
	photo by Joseph Marzullo/WENN

Tony Award winner Bernadette Peters: We know she will be a smash in her guest appearance on "Smash," but wouldn't it be great if Follies star Peters made a pit stop at McKinley High? The Tony winner, who has also starred in Sondheim productions of A Little Night Music, Sunday in the Park With George, Into the Woods and Gypsy (lyrics by Sondheim), would be perfect for a Sondheim-themed “Glee” episode. Peters would be the ideal vocal coach for a heartfelt duet of “No One is Alone,” a “Being Alive”-ballad for Kurt (Chris Colfer) or even McKinley’s next musical... Sweeney Todd?

	John Gallagher Jr.
	photo by Joseph Marzullo/WENN

Tony Award winner John Gallagher Jr.: Jonathan Groff has been on and off the series with another return engagement planned. Maybe the whole Spring Awakening gang could be reunited once more. Gallagher, who was recently seen in Jerusalem and starred in the original company of American Idiot, could be the series' next bad boy. Wouldn't it be great if Jesse St. James brought along his badass best friend when he returns to "Glee" this season?

	Annaleigh Ashford

Rent star Annaleigh Ashford: Things don’t seem to be working out between Brittany (Heather Morris) and Santana (Naya Rivera). If Ashford, who currently plays bisexual performance artist Maureen Johnson in the Off-Broadway revival of Rent, stepped in, Santana may have a shot at a healthy relationship. Ashford, who was last seen on Broadway in Hair, would fit right in with the New Directions and stir up just enough drama for Brittany to make up her mind—would she fight for Santana?

	Taye Diggs
	photo by Joseph Marzullo/WENN

Wicked and Rent star Taye Diggs: Isn't Noah Puckerman (Mark Salling) just a bit too young to be making out with his substitute teacher, Shelby Corcoran (Menzel)? Diggs, who co-starred with Menzel in the original company of Rent, would be a perfect match for the single mom on the television series—considering the fact that they have been married since 2003. Mercedes (Amber Riley), who just nominated herself as president of Corcoran's Trouble Tones, tends to let power go to her head. If things get out of hand and Corcoran needs to meet with her father, it would be an opportune time for Diggs to step into the halls of McKinley.

	Sutton Foster
	photo by Joseph Marzullo/WENN

Tony Award winner Sutton Foster: When the New Directions face competition time, they always seem to lack in their dance moves. How could they not win with Foster as the glee club choreographer? We can't forget her Tony-winning performance in Thoroughly Modern Millie or her "Show Off" number in Drowsy Chaperone, not to mention her current Tony-winning performance as Reno Sweeney. She could teach the club a couple of moves (a New Directions tap number?), and just imagine a duet with Mr. Schuester (Morrison)!

	Andrew Keenan-Bolger
	photo by Joseph Marzullo/WENN

Newsies and Mary Poppins star Andrew Keenan-Bolger: Sebastian Smythe (Grant Gustin) has recently been factored into the equation of Kurt and Blaine (Darren Criss). If the couple does, in fact, breakup, Kurt is going to need a new love interest. Keenan-Bolger, who was recently seen as Crutchie in the Paper Mill Playhouse production of Newsies, could pick up the pieces if and when Blaine decides to try things out with Sebastian—Ryan Murphy did say that the honeymoon stage was coming to an end.

	Shoshana Bean

Wicked’s Shoshana Bean: Since Gwyneth Paltrow left the building last season, McKinley High needs a new substitute teacher. Bean, who has played Elphaba in Wicked and has also been seen in the Tony Award-winning musical Hairspray, possesses just the right amount of pizzazz to stir things up at McKinley when Morrison (who shared the stage with Bean in 2002 when he played Link Larkin) is absent. Not only can she sing the showtunes, but her riff-happy vocals and pop-star quality would succeed when faced with Z100’s playlist. (Have you seen her recent cover of Adele's "Rolling in the Deep"?)

	Joel Grey
	photo by Joseph Marzullo/WENN

Tony Award winner Joel Grey: We've met Sue Sylvester's (Jane Lynch) mother, but we have yet to meet the rest of the family. Grey, who currently stars in the Tony-winning revival of Anything Goes, could show up as Sue's uncle; this means that we would also have to see a return of Carol Burnett, who played Dorris Sylvester. Who wouldn't enjoy an episode starring a trio of Lynch, Burnett and Grey? And, while we're at it, how about Betty Buckley as Sue's long-lost sister?