what is "the spanish teacher"?
It is an episode of the American musical television series "Glee".
The Spanish Teacher
"The Spanish Teacher" is the twelfth episode of the third season of the American musical television series "Glee", and the fifty-sixth overall. 
wiki:19741931
The Spanish Teacher [SEP] Introduction
"The Spanish Teacher" is the twelfth episode of the third season of the American musical television series "Glee", and the fifty-sixth overall. Written by co-creator Ian Brennan and directed by Paris Barclay, the episode aired on Fox in the United States on February 7, 2012. It features special guest star Ricky Martin as a night-school Spanish teacher whom Will Schuester (Matthew Morrison) introduces to McKinley High, and shows several of McKinley's teachers competing for a promotion when a tenured position unexpectedly becomes available. The episode received mixed to positive reviews, and many critics considered Martin to be a highlight. Reaction to the music as a whole was less enthusiastic than for the episode itself, though "La Isla Bonita" and "Don't Wanna Lose You" were given a generally favorable reception.