Billy Bob Thornton
Cast member Billy Bob Thornton poses at the premiere of "The Judge" at the Academy of Motion Picture Arts and Sciences in Beverly Hills, California October 1, 2014. The movie opens in the U.S. on October 10. REUTERS/Mario Anzuoni

"The Big Bang Theory" is moving back to Thursday night. The episode 1 of Season 8 premiered on Monday night because of Thursday Night Football schedule. After airing six episodes on Mondays, CBS will be telecasting episode 7 on Thursday, Oct. 30, 2014. The episode 8 of "The Big Bang Theory," which is titled "The Misinterpretation Agitation," is going to feature "Fargo" actor Billy Bob Thornton as a guest-star, according to spoiler reports.

The Season 8 opened with Sheldon returning to Pasadena after his train journey across the country. Penny got a new job as a pharmaceutical sales representative. Stuart became a permanent resident at Mrs Wolowitz's house, much to the chagrin of Howard. The last episode saw Penny and Leonard fighting about money, as Penny sold the car that Leonard gave her and presented him the money. They trigged an ugly fight between Howard and Bernadette when they went to them to know how they handle money issues as a couple. It was also revealed that Sheldon's new topic is dark matter.

In episode 7, Thornton is the portraying the role of a womanising urinary doctor, according to leaked spoilers. Thornton's character, "a celebrity specialist," lands up at Penny's door after she flirts with him to sell her company's medicines. He is her biggest client. The spoilers reveal that Thornton's character tells Leonard that he is there to begin a romantic relationship with Penny. However, he leaves when Leonard tells him that he and Penny are engaged. Later, Penny admits to Leonard that she flirts with the doctors and hides her engagement ring.

Also in the episode, Thornton's character hits on Amy as well as on Bernadette. According to the spoilers, the relationship between Thornton's character and his mother is a bit like Howard and his mother. He also has a room full of video games and movie robots. The spoilers reveal that Sheldon will be telling the doctor that Leonard and Penny's relationship is going to fail.