It's John Stamos on Glee! He plays a dentist who is smitten with Emma on season two.
Added:
Looking pretty, Lea Michele! The actress smiles here for a season two promotional image.
Added:
The amazing Chris Colfer poses here for a promotional photo. He was nominated for an Emmy for his work on season one.
Added:
What perfect guest casting. John Stamos will come on board Glee in season two as a dentist who dates Emma.
Added:
Finn and Rachel will be a legitimate couple on season two of Glee. Expect a lot of PDA, as evidenced here.
Added:
New Directions kick back and watch the stage in this scene from the show's second season premiere. The episode is titled "Audition."
Added:
Almost the entire cast of Glee is pictured here in the episode "Audition." That's the title of the second season premiere.
Added:
Will Puck and Quinn give their relationship a real chance on season two of Glee? They look chummy in this scene, don't they?
Added:

Glee Quotes

[to Finn] You know, I don't really know what's going to happen between us, but I know that you used to be the guy that would make me feel like the most special girl in the whole world, and it doesn't feel that way anymore. Now it just feels sad and confusing. And the worst part is that it doesn't even feel that bad anymore.

Rachel

I just want somebody to love me.

Quinn