July 17, 2009 at 12:00 PM EDT

When Mary McDonnell guest stars alongside Kyra Sedgwick on The Closer starting Monday, brace yourself for the Clash of the Strong Female Leads of Cable. Former Battlestar Galacticapresident McDonnell (far left) plays an internal affairs investigator who gets in the way of Kyra Sedgwick’s Deputy Police Chief Brenda Johnson in a three-episode guest stint on the TNT drama ­starting July 20. They’ll both be poking around the deaths of two officers whose funeral they’re dressed for here. “I’m a fan of the show,” McDonnell says. And as such, she geeked out on this particular sequence, which takes Deputy Chief Johnson out of her Southern Belle suits and into dress blues: “The wonderful thing for me was to be involved in the scene where we see Brenda in uniform for the first time.”

What do you think, PopWatchers? Are you psyched to see President Roslin and Deputy Chief Johnson square off? What do you think of Brenda in uniform?

addCredit(“Karen Neal/TNT”)

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