Will assigns the glee club a Spanish singing assignment, and enlists the help of his musically-inclined night school teacher (Guest star Ricky Martin). Meanwhile, Rachel spills the beans to Kurt and Mercedes on Finn’s marriage proposal, and Mercedes has love complications of her own. Musical performances include "La Cucaracha", "Sexy And I Know It", "Don't Wanna Lose You", "Bamboleo/'Hero' Medley", "La Isla Bonita" and "A Little Less Conversation".