In "Big Brother," Blaine's (Darren Criss) brother Cooper (Matt Bomer) comes to town, but their brotherly relationship is a little bit rocky.
Cooper comes to McKinley to teach an acting class, even though his words of wisdom on the subject may be a bit limited.
After all, his only claim to fame as an actor is a free credit rating commercial!
Fans of 'Glee' will also find out what happens to Quinn (Dianna Agron) after the texting-while-driving-car-accident cliff hanger from the last episode.
The students also go to an amusement park for their senior skip day.
This is a big episode for Darren Criss, who sings in three of the songs, including two with guest star Matt Bomer.
Darren and Matt will sing a Duran Duran mashup and 'Somebody That I Used to Know' together, while Darren takes solo duty on Christina Aguilera's 'Fighter.'
Quinn and Artie (Kevin McHale) take the lead on the remaining two songs, singing 'I'm Still Standing' and 'Up Up Up.'
In an interview with TV Guide, Matt Bomer says this is a "real comedic gift of a role," adding that "Cooper's got such strong convictions and opinions about acting that are all completely idiosyncratic and, you know, not to be shared in public. Or with groups of kids [laughs]."
Will we see Cooper return to 'Glee' again? Matt said, "Not before the season ends... But hopefully next season he will!"
Somebody That I Used to Know by Goyte – Blaine and Cooper
I'm Still Standing by Elton John – Artie and Quinn
Hungry Like the Wolf/Rio – Blaine and Cooper
Fighter by Christina Aguilera – Blaine
Up, Up, Up by Givers – Artie and Quinn