WARNING: This article contains spoilers for Madam Secretary season 6 that may influence your enjoyment in discovering the plotlines. Read at your own risk.

Prison Break star has joined the cast of Madam Secretary season 6. Wentworth Miller will be introduced in the second episode as a recurring character named Senator Mark Hanson. 

Madam Secretary season 6 episode 2, titled "The Strike Zone," will find Mike (played by Kevin Rahm) facing a Senate Intelligence Committee, per the episode synopsis. He'll need to answer allegations that his boss, Elizabeth McCord (played by Tea Leoni), had help from Iran to win in the presidential elections. 

As viewers may have seen from the premiere last week, Madam Secretary season 6 opened with Elizabeth now serving the country as president in her first 100 days. However, the new Commander-in-Chief has been slapped with accusations that she rigged her win.

Meanwhile, the chairman of the Senate Intelligence Committee is Miller's Sen. Hanson. According to TV Line, this character is a "major power broker" with significant influence on Capitol Hill and will be a difficult adversary to topple if Elizabeth and her team play hardball during the investigations. 

Madam Secretary season 6 episode 2 will air on Sunday, Oct. 13, on CBS. This season will be its final run with only ten episodes to air. 

Originally, Madam Secretary season 6 was supposed to be a story on her path to the presidency. However, the producers decided over the summer to jump ahead and let her become the President of the United States. So, most of the storyline for this last outing will be the exploration of Elizabeth as the first female leader sitting in the Oval Office, Leoni told TV Insider

Executive producer Lori McCreary also revealed that Madam Secretary season 6 will highlight the difference when a woman is in power as opposed to a man as the highest leader of the land. McCreary said that there are elements that people usually do not notice about the difference, which will be pointed out in the series. She also teased that viewers will get to experience what she thinks are the fantasies that people have when the president is a woman. 

However, in changing the show's direction, some of the characters from the previous seasons of Madam Secretary will no longer be back for the sixth season. Essentially, the final year will feel like a different show, but the producers promised it would end in a way that fans will never forget.