Credit: Jordin Althaus/Adam Rose/FOX ©2011 Fox Broadcasting Co.

Glee is officially back! Quinn (Dianna Agron) and Blaine (Darren Criss) both took centerstage during Season 3, Episode 15: "Big Brother," and we think the results were absolutely phenominal. Take a moment to watch each of the great performances, then sound off in the comments to let us know which ones were your favorites!

(Note: If you're having trouble getting the videos to play, try clicking the blue "Video" link underneath.)

Credit: Glee on Fox on YouTube Photo: Watch! Darren Criss' Blaine Sings Christina Aguilera's "Fighter" in Glee Season 3, Episode 15: "Big Brother" (VIDEO)
Credit: Glee on Fox on YouTube Photo: Watch! Full Performance of Darren Criss's Blaine and Matt Bomer's Cooper Singing Gotye's "Somebody I Used to Know" in Glee Season 3, Episode 15: "Big Brother" (VIDEO)