Grant Gustin Joins GLEE, Will Be Part of Kurt/Blaine Triangle Story (Spoilers)

Grant Gustin has joined the cast of GLEE in the role of Sebastian, a member of the Dalton Academy Warblers who has his eyes set on Blaine (Darren Criss).

Sebastian is up to no good when it comes to Blaine's relationship with his current boyfriend, Kurt (Chris Colfer).

"I'm making moves in my first episode to split them up," Gustin told The Virginian-Pilot. "Maybe I will split them up, and maybe I won't. No one knows yet. I don't even know."

Gustin will make his first appearance on the show's November 8 episode (in which Kurt and Blaine make love for the first time) and expects his character to return to the show. "It wouldn't make sense for him not to be around for a little bit to create some drama and stir up the pot a little," Gustin said. "It could be something huge. That's the exciting part."

A GLEE insider declares to TVLine that Sebastian is “our villain this season.”

GLEE returns with new episodes on November 1 on FOX.