John Stamos on Glee -- FIRST LOOK!

Scope out this first still of John Stamos as dentist Dr. Carl Howell giving Matthew Morrison‘s Mr. Schuester a check-up in Season 2′s second episode of Glee — the Britney Spears ep!!!

Stamos, 47, will also play the beau of OCD guidance counselor Emma (Jayma Mays). Carl will also be administering anesthesia to Rachel, Artie, Brittany and Santana, inspiring a dreamy sequence that will take them into the world of Brit Brit.

“Just when Will thinks he’ll win Emma because he can sing and dance, we find out Carl used to be in an ’80s boy band,” reveals John to TV Guide. “I discover Will’s chewing his teeth, so the other day I had, like, four fingers in Matthew Morrison‘s mouth.”

Other pics include MM, Chris Colfer, Emmy Award winner Jane Lynch, Jenna Ushkowitz and Kevin McHale, shooting a promotional vignette for Members Project from American Express as part of a charity call to action that kicked off Wednesday, September 1.