Photo Flash: THE GOOD WIFE's 'A More Perfect Union,' Airing 4/21

On THE GOOD WIFE's upcoming episode, titled "A More Perfect Union," Alicia represents a group of software coders in a contract dispute as a favor to her mother, but the case causes unexpected consequences to the firm. Meanwhile, Peter asks Alicia to renew their vows and Kalinda plays two sides of the firm against each other, on Sunday, April 21 (9:00-10:00 PM, ET/PT) on CBS. Mamie Gummer returns as Nancy Crozier. Journalist and CBS THIS MORNING host Charlie Rose guest stars as himself.

Check out a first look below!

Photos by: David Giesbrecht/CBS

Mamie Gummer, Julianna Margulies, Matt Czuchry, John Michael Higgins,

Mamie Gummer, Julianna Margulies, Matt Czuchry

Mamie Gummer, Julianna Margulies, Matt Czuchry

Julianna Margulies

Mamie Gummer

Mamie Gummer, Julianna Margulies, Matt Czuchry

Josh Charles

Christine Baranski