Here's how Fox describes the episode: "Will (Matthew Morrison) assigns the glee club a Spanish singing assignment, and enlists the help of his musically-inclined night school teacher (guest star Martin). Meanwhile, Rachel (Lea Michele) spills the beans to Kurt (Chris Colfer) and Mercedes (Amber Riley) on Finn’s (Cory Monteith) marriage proposal, and Mercedes has love complications of her own."
Here, Martin talks about his trip to McKinley High, and Fox offers a first look at his performance of "Sexy and I Know It."
Martin, who will begin performances in Evita March 12 at the Marquis Theatre, has also been seen on Broadway in Les Miserables.
"Glee" airs Tuesday nights on Fox at 8 PM ET.
To check out the behind-the-scenes action, look below:
To watch the full performance of "Sexy and I Know It," look below:
