Sue Sylvester
Cheerleading coach Sue Sylvester (Jane Lynch) is appointed acting principal of William McKinley High School after having Principal Figgins (Iqbal Theba) infected with the flu. Glee club director Will Schuester (Matthew Morrison) is also infected, and takes time off work to recover. He is cared for by his ex-wife Terri (Jessalyn Gilsig), which leads to them sleeping together.