Series star Matthew Morrison reveals the actor will romance actress Dianna Agron's cheerleader character Quinn Fabray on the upcoming anniversary show, which will air in two parts.
Morrison tells Eonline.com, "I think he's going to be Dianna Agron's new love interest. His name is Biff. He's kind of a... degenerate."
Gwyneth Paltrow is also said to be reprising her role as substitute teacher Holly Holiday for the big episode after appearing on Glee in 2010 and 2011.
The 100th anniversary episodes will air in the U.S. in March (14).