The Big Bang Theory premiere photo shows Penny's family

Plus: Katey Sagal and Jack McBrayer join the CBS comedy and 11 more photos!

Pennys close with her dad [Keith Carradine], EP Steve Molaro tells EW.

The Big Bang Theoryreturns Monday, Sept. 19 at 8 p.m.

Credit: Monty Brinton/Warner Bros. Entertainment

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.

Monty Brinton/Warner Bros. Entertainment Inc.