Penn and Astin will play physicists who by accident confirm Sheldon and Amy's super-asymmetry theory, which could have a major impact on how things turn out. There is no word yet on when the episode featuring Penn and Astin will air.
There were reportedly discussions about a 13th season, but they never materialised. The five original actors are set to make around $900,000 per episode for the 12th season, according to Variety.
Season 11 averaged 14 million viewers per episode, making it one of the most popular shows on TV, according to Variety. A spinoff, Young Sheldon, premiered in 2017.
In other news, Home Alone actor Macaulay Culkin says he was pursed for a part in The Big Bang Theory years ago but he turned it down multiple times.
Read the original article on gamespot.com.
More about: BigBangTheory