It's an "ER" reunion on "The Good Wife" when Maura Tierney makes her debut as Maddie Hayward, a millionaire business professional who considers giving to Peter Florrick's (Chris Noth) gubernatorial campaign.

In the photos from "And The Law Won," Julianna Margulies reunites with her former "ER" co-star Tierney. It looks like Christine Baranski's Diane Lockhart will also have a meeting with Tierney's character. Take a look at the new photos below.

"The Good Wife" Season 4 premieres 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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