In the video, the cast from the hit Fox comedy are seen trying to avoid an onslaught of dodgeballs thrown by Jane Lynch's Sue Sylvester. The clip promises that "this school year will be impossible to miss".
Watch the Glee season three promo below:
Lea Michele and Kevin McHale recently spoke to Digital Spy about their hopes for the third season of Glee.
"I really want to see these characters outside of high school, what happens when they go home," Michele said.
"I've been saying that since season one and nothing's happened, so I don't know if anything's going to change! But it would be great."
McHale also joked that he wants Artie to "have a relationship that lasts a little longer than a few months".
Glee will return with its third season on September 20 on Fox.
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Watch the cast of Glee discuss season three with Digital Spy below: