'Glee': 'Mash Off' in pictures
Not only does the episode include the 300th Glee performance - which you can preview here - but Sue's starting a smear campaign. Oh goodness.
Elsewhere, Will and Shelby are planning a friendly competition (hmm, "friendly"), and Puck's got a crush. Any chance that crush is on Shelby?
Take a look at some photos from the next episode of Glee below!
Glee airs on Tuesday at 8/7c on Fox in the US and on Thursday at 9pm on Sky1 in the UK.