'Glee' Preview: New Directions Heads to Regionals (Video)

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"Glee's" Kevin McHale, Dianna Agron, Amber Riley and Lea Michele

After a confrontation over rights to perform Michael Jackson songs at Regionals that left Blaine injured, McKinley High's New Directions and the Dalton Academy Warblers will have their showdown on Tuesday.

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During the episode, titled "On My Way," Sebastian (Grant Gustin) commits "show choir terrorism" and attempts to blackmail Rachel (Lea Michele) and the New Directions, threatening to post a (Photoshopped) image of Finn if she doesn't drop out of the competition within 24 hours.

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Elsewhere, the Troubletones will have their moment in the spotlight as McKinley's all-girl group that has since been folded into New Directions makes good on the group's vow that they cover Kelly Clarkson at Regionals.

Watch a preview of Sebastian's confrontation, the Warblers' cover of The Wanted's "Glad You Came" and the Troubletones take on Kelly Clarkson's "Stronger," plus listen to the rest of the songs set to be featured in the episode below.

The Wanted's "Glad You Came" as performed by the Warblers

Young the Giant's "Cough Syrup," as performed by Blaine (Darren Criss):

Lenny Kravitz's "Stand" as performed by the Warblers

Nicki Minaj/R. Kelly's "Fly"/"I Believe I Can Fly" by New Directions

Kelly Clarkson's "What Doesn't Kill You (Stronger)" by the Troubletones

Halestorm's "Here's To Us" by New Directions

Glee's winter finale airs Tuesday at 8 p.m. on Fox. What are you most looking forward to seeing?

Email: Lesley.Goldberg@thr.com; Twitter: @Snoodit