Baranski played Diane Lockhart on the CBS series The Good Wife, which aired from 2009 to 2016, and reprised the role for its spinoff series, The Good Fight. On The Late Show, Baranski confirmed Patinkin plays a "crackpot judge" in the new season.
"He's playing a rather crackpot judge who takes it upon himself to create a kangaroo court and it's a role that he's so perfect for," Baranski said. "And he's with us almost the whole season. And it's funny and audacious."
"The great thing, in addition to Mandy, because, you know, Broadway has been shut down. We've just had our pick of the greatest Broadway actors who just come in and do roles -- and they're judges and they're lawyers -- and they do cameos," she added. "And so you just are looking at the crème de la crème of New York theater when you watch our show."
CBS All Access shared a trailer for The Good Fight Season 5 this month that shows Patinkin's character, Hal Wackner, creating his own courtroom in the back of a copy shop.
Season 5 will see Diane (Baranski) question her role as partner at the Black law firm she runs with Liz Lawrence (Audra McDonald). The season will explore anti-Black discrimination and lack of diversity in the workplace, the aftermath of the COVID-19 pandemic and more.
On The Late Show, Baranski and host Stephen Colbert also discussed Broadway's impending return. The pair celebrated by singing Stephen Sondheim's "Side by Side by Side," a song from Sondheim's musical Side by Side.
"These performers have been home or doing nothing for over a year. Imagine being a performing artist who can't do, dance, sing, do that thing that they do," Baranski said. "Everybody's been on hold for such a long time. I think it's going to be so emotional."