Glee is about to get a whole lot meaner.

TV Line reports that Grant Gustin has booked his return to the Fox hit, as his bullying character of Sebastian will appear on multiple Season 4 episodes.

Sebastian, of course, debuted last year as the openly gay lead singer of the Dalton Academy Warblers... who was very open with his feelings for Blaine.

How will the character fit in now that Nolan Gerard Funk has been cast as the new lead singer of the Warblers? We'll need to tune in and find out.

Glee returns with its take on Grease on November 8.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.