When does 30 Rock return?

30 Rock is an American satirical sitcom television series created by Tina Fey. The series is based on Fey's experiences as head writer for Saturday Night Live. The pilot episode premiered on October 11, 2006, and seven seasons followed. 30 Rock won several major awards, including Primetime Emmy Awards for Outstanding Comedy Series in 2007, 2008, and 2009. The Writers Guild of America West named 30 Rock the 21st best-written television series.
Liz Lemon is head writer and showrunner of the NBC sketch comedy series TGS with Tracy Jordan. She supervises cast and crew, including star Jenna Maroney, her best friend, while working with network executive Jack Donaghy and page Kenneth Parcell. The show satirizes the cultures of NBC and entertainment industry.