Is the idyllic romance between Darren Criss and Chris Colfer on the Fox musical-comedy Glee headed for trouble?

On the show's season premiere, Criss' Blaine Anderson swapped crooning for the Dalton Academy Warblers for a less-visible spot on William McKinley High's New Directions to be near his boyfriend Kurt Hummel, played by Chris Colfer.

According to Michael Ausiello's, the party might be coming to an end for the happy couple as a new competitor enters the picture.

In the show's fifth episode, which is expected to be broadcast sometime in November, Sebastian (played by Grant Gustin), a gay Dalton Academy Warbler, sets his sights on Blaine.

“He's our villain this season,” an unnamed source told Ausiello. “It's a major role.”

Sebastian “is the polar opposite of Kurt in every possible way. He's more like the male version of Santana in that he's both promiscuous and kinda-sorta scheming,” the site reported.

Gustin's credits include playing Baby John in the national tour of West Side Story.

(Related: Glee's Chris Colfer, Max Adler in a gay bar.)