"THE BIG BANG THEORY" PREMIERES ITS EIGHTH SEASON WITH A BANG WITH ONE HOUR OF BACK-TO-BACK ORIGINAL EPISODES ON ITS NEW NIGHT, MONDAY, SEPT. 22

Editor's note: The start and end times of these episodes have changed.

Steven Root Guest Stars as Bernadette's Boss And Regina King Returns as Mrs. Davis

"The Locomotion Interruption" - Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon. Meanwhile, Penny interviews for a job at Bernadette's company, and Howard is weirded out by Stuart's relationship with Mrs. Wolowitz, on THE BIG BANG THEORY, Monday, Sept. 22 (8:00-8:31 PM, ET/PT), on the CBS Television Network.

"The Junior Professor Solution" - When Sheldon is forced to teach a class, Howard surprises everyone by taking it. Meanwhile, the tension between Penny and Bernadette gives Amy a chance to play both sides, on THE BIG BANG THEORY, Monday, Sept. 22 (8:31-9:00 PM, ET/PT), on the CBS Television Network.

THE BIG BANG THEORY will return to Thursdays, (8:00-8:31 PM, ET/PT) on Oct. 30, 2014.

(For "The Locomotion Interruption"):

REGULAR CAST:

Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco-Sweeting (Penny)
Simon Helberg (Howard)
Kunal Nayyar (Rajesh)
Mayim Bialik (Amy)
Melissa Rauch (Bernadette)

RECURRING CAST:

Kevin Sussman (Stuart)
Carol Ann Susi (Mrs. Wolowitz)

GUEST CAST:

Stephen Root (Dan)

STORY BY: Jim Reynolds, Maria Ferrari and Tara Hernandez

TELEPLAY BY: Steven Molaro, Steve Holland and Eric Kaplan

DIRECTED BY: Mark Cendrowski

(For "The Junior Professor Solution"):

REGULAR CAST:

Johnny Galecki (Leonard)
Jim Parsons (Sheldon)
Kaley Cuoco-Sweeting (Penny)
Simon Helberg (Howard)
Kunal Nayyar (Rajesh)
Mayim Bialik (Amy)
Melissa Rauch (Bernadette)

GUEST CAST:

Regina King (Mrs. Davis)

STORY BY: Steven Molaro, Eric Kaplan and Steve Holland

TELEPLAY BY: Jim Reynolds, Maria Ferrari and Tara Hernandez

DIRECTED BY: Mark Cendrowski