After months and months of waiting, CBS’ hit series ‘The Big Bang Theory’ will return tonight for the start of season eight. Steven Root is set to guest star on the series premiere as Bernadette’s Boss and Regina King will return as Mrs. Davis.

In the premiere episode, called “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.

As for the second-half the one-hour block, fans will see “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. THE BIG BANG THEORY will return to Thursdays, (8:00-8:31 PM, ET/PT) on Oct. 30, 2014.