According to EW, Overstreet will play Ralph Wilkerson, a new fourth grade teacher to Brick (Atticus Shaffer).
Look for the character's teaching methods to conflict with the Heck family's relaxed parenting style.
Overstreet, who was offered a new recurring contract on 'Glee' but turned it down, will appear on the Sept. 28 episode of the ABC sitcom.
The series kicks off Season 3 on Sept. 21 at 8PM.
Tamara Tunie is trading her scrubs in for a judge's robe. The 'Law & Order: SVU' star will guest on 'Days of Our Lives' as Judge Weston. She'll play a pivotal role in deciding the fate of John Black's (Drake Hogestyn) life. [TVLine]
Tahmoh Penikett will headline TNT's 'Innocent.'Penikett will play Jim Brand, a hot-headed prosecutor opposite Bill Pullman, Marcia Gay Harden, Richard Schiff and Alfred Molina. [TVLine]
Debbie Allen is checking into 'Grey's Anatomy.' Allen will play Jackson's mother Catherine. [EW]
'Game of Thrones' has found its Balon Greyjoy. Patrick Malahide will play Theon's father, the ruler of the Iron Islands. [EW]
Giancarlo Esposito has joined the cast of USA's drama pilot 'Over/Under.' Esposito will play Oliver, an artist and one-time teacher to Georgette (Caroline Dhavernas). [TV Guide]