We’ve already seen the Britney Spears pictures from “Glee’s” second episode back, titled “Britney/Brittany,” but what else is going on besides a tribute to the pop princess?

In the Sept. 28 episode, John Stamos stops by as Dr. Carl Howell, a dentist who romances Emma (Jayma Mays), and puts into motion the dream sequences that bring Spears to “Glee.”

Here’s the rascally Dr. Carl now:

john stamos glee 350x500 'Glee' new 'Britney/Brittany' pics: John Stamos, Rachel Finn and moreBack at William McKinley High, Artie (Kevin McHale) and Finn (Cory Monteith) have a heart to heart in the boys’ locker room. Hmm, we’re wondering what Artie is doing there. Could he be the new water boy?

glee kevin mchale cory monteith s2ep2 'Glee' new 'Britney/Brittany' pics: John Stamos, Rachel Finn and moreNew football Coach Beiste (Dot Jones) might have a few choice words for them.

glee dot jones kevin mchale cory monteith s2ep2 'Glee' new 'Britney/Brittany' pics: John Stamos, Rachel Finn and moreOkay, is the locker room now becoming Grand Central Station? What’s Rachel (Lea Michele) doing here? She doesn’t look too pleased, but it has to be pretty upsetting news to make Rachel invade a smelly all-male sanctum, in which she could be confronted by jock straps and worse.

glee lea michele s2ep2 01 'Glee' new 'Britney/Brittany' pics: John Stamos, Rachel Finn and moreAww, at least Finn is trying to help out. Maybe this has something to do with her parents?

glee lea michele s2ep2 02 'Glee' new 'Britney/Brittany' pics: John Stamos, Rachel Finn and more“Glee” returns for its second season on Tuesday, Sept. 21.

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Photo credits: FOX