Glee's Super Bowl Ep: Why So Blue, Cheerios?

Plus, Brittany S. Pierce (Heather Morris) is mad as hell and she's not gonna take it anymore!

Let's just surrender and declare this Katy Perry day in TV land.

First we got pics of Perry's cameo on How I Met Your Mother, and now come photos of Glee's already-epic Super Bowl episode depicting the McKinley High Cheerios performing Perry's "California Gurls," complete with Perry-style blue wigs. 

What else do the pics reveal?

The latest Glee shots also show what happens when Rachel Berry (Lea Michele) becomes one of the walking dead, and illustrate the key emotional arc of the episode: the aftermath of a Slushee attack on poor Artie (Kevin McHale).

Bullies of the world, take heed: Brittany S. Pierce (Heather Morris) is mad as hell, and she's not gonna take it anymore!