Sons of Anarchy star Katey Sagal is going to be on Glee, Ryan Murphy announced last night. According to his tweet, Sagal will be playing Artie's mom. (How have we never met Artie's mom?) Sagal's an accomplished singer — she used to sing backup for Bette Midler — but honestly, we hope she channels some Gemma and kills one of the Glee kids. It's time.