Grant Gustin

Just when we thought Kurt (Chris Colfer) and Blaine (Darren Criss) were going to get to be happy for awhile...

Grant Gustin has joined the cast of Glee as Sebastian, a Dalton Warbler and potential love interest for Blaine, TVLine.com reports. Just because he's a Warbler, doesn't make him a nice guy. In fact, he's described as the male version of Santana (Naya Rivera).

Glee: The 10 best and 10 worst performances

Gustin, whose theater credits include West Side Story (very fitting!), will first appear in Episode 5 of the third season, which airs Tuesdays at 8/7c on Fox.

What do you think? Let us know in the comments below.