"The Good Wife" Season 4 gets right down to business and puts Kalinda in a showdown with her ex-husband.

In "The Good Wife" Season 4 premiere, Alicia (Julianna Margulies) comes to Zach's (Graham Phillips) defense when he's targeted by an "overzealous" state trooper. Plus, Kalinda (Archie Panjabi) stands her ground with her ex, Nick (Marc Warren), after last season's tense cliffhanger. CBS revealed the Season 4 premiere details in a press release.

Additionally, Kristin Chenoweth will appear as political reporter Peggy Byrne, a role that was supposed to be recurring, but an injury she suffered on set forced Chenoweth to leave the series. "It is with deep regret to inform everyone that due to my injuries, I am unable to return to 'The Good Wife,'" Chenoweth said in a statement. "[I'm] getting better slowly, and thank you everyone for your concern."

In a statement, CBS Television Studios said the show enjoyed having Chenoweth as part of the cast and "would love to have her back when she's feeling better."

The Season 4 premiere, currently titled "I Fought the Law," also features Nathan Lane as Clarke Hayden, the firm’s appointed trustee. Look for Will (Josh Charles) and Diane to have their hands full when it comes to the firm's financial situation.

Christine Baranski teased major Season 4 changes. "[Season 4] picks up at a very dramatic moment for all the characters," she said in an "Entertainment Tonight" interview. "The firm is definitely in crisis."

Take a look at some of the Season 4 guest stars in the gallery below. "The Good Wife" Season 4 kicks off Sun., Sept. 30 at 9 p.m. ET on CBS.

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  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "What's In The Box?"

    "What's In The Box?"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "What's In The Box?"

    "What's In The Box?"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "A More Perfect Union"

    "A More Perfect Union"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "Rape: A Modern Perspective"

    "Rape: A Modern Perspective"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "The Wheels Of Justice"

    "The Wheels Of Justice"

  • "Death of a Client"

    "Death of a Client"

  • "Death of a Client"

    "Death of a Client"

  • "Death of a Client"

    "Death of a Client"

  • "Death of a Client"

    "Death of a Client"

  • "Runnin’ With The Devil"

    Archie Panjabi as Kalinda Sharma.

  • Kalinda (Archie Panjabi, right) reluctantly agrees to train Robyn (Jess Weixler, left) when Will and Diane decide to hire a second investigator at the firm

    Kalinda (Archie Panjabi, right) reluctantly agrees to train Robyn (Jess Weixler, left) when Will and Diane decide to hire a second investigator at the firm.

  • "Runnin' with the Devil"

    Jess Weixler as Robyn, who is being reluctantly trained by Kalinda to be a second investigator at the firm.

  • "Runnin' with the Devil"

    Audra McDonald as Liz, Alicia’s law school classmate and current courtroom foe.

  • "Runnin' with the Devil"

    Alicia (Julianna Margulies, right) speaks with her old law school classmate – and current courtroom foe – Liz (Audra McDonald).

  • "Runnin' with the Devil"

    Jailed drug dealer Lemond Bishop requests that Alicia (Julianna Margulies) work with his other lawyer, Charles Lester (Wallace Shawn), but soon begins to suspect his motives.

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

  • "Going for the Gold"

    "Going for the Gold"

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