In February 2014, CBS CEO Leslie Moonves confirmed an eighth season, when announcing that the first part of the new season would air on a different night, due to to Thursday Night Football games. In May 2014, CBS announced at its annual upfront presentation, that the series would begin its eighth season on Mondays, before returning to the Thursday slot it has held since 2010 on October 30, once the football games end.
Delay
Production for the season was expected to begin on July 30, 2014, however the start was delayed due to the five main cast members' desire to renegotiate new contracts, with Johnny Galecki, Jim Parsons and Kaley Cuoco seeking approximately $1 million per episode, as well as more backend money. Simon Helberg and Kunal Nayyar negotiated together, separate from Galecki, Parsons and Cuoco's negotiations. Production was officially delayed on July 30, due to the contract negotiations, and was rescheduled for August 6, 2014. On August 4, Galecki, Parsons and Cuoco signed new contracts, worth $1 million per episode for three years, with the possibility to extend for a fourth year. The deals also include larger pieces of the show, signing bonuses, production deals and advances towards the back-end. The following day, Helberg and Nayyar renegotiated their contracts, giving them a per-episode pay in the "mid six-figure range", up from around $100,000 per episode they each received in years prior. The first table read for season 8 took place on August 6.
Premiere
The first episode of season 8, "The Locomotion Interruption", first aired in the US on September 22, 2014. In Australia, season 8 premiered on October 13, 2014. In the UK, "The Locomotion Interruption" first aired on October 23, 2014.
The eighth season received positive reviews. MaryAnn Sleasman of TV.com praised character developments, and wrote that "there's a lot to be excited about with regard to this coming season" with some of the central characters more comfortable around each other. Emily Gould of Salon criticized the humor, writing that "I watched all seven episodes that had aired so far this season and didn't so much as expel air forcefully from my nose in response to any of the jokes". Oliver Sava of The A.V. Club also criticized the humor, writing that "A lot of the jokes are tired and the plotlines are standard sitcom material, but if it's worked for seven seasons, why switch it up now?"