ER alumna Gloria Reuben and Marsha Mason are set to co-star opposite Geena Davis in TNT‘s untitled quirky bounty hunter drama pilot from Dean Devlin‘s Electric Entertainment, Ternion Productions and 3 Arts. I’ve learned that Flashpoint‘s Enrico Colantoni also has been tapped for a lead role in the project, penned by Scott Prendergast and Amy Berg. Inspired by the real-life story of bounty hunter Mackenzie Green, the drama stars Davis as Mackenzie “Mack” Green, an unconventional bail bondswoman and bounty hunter whose eccentric personality and unusual tactics give her an advantage in a tough and unpredictable business. Reuben will play Assistant D.A Kate Mickelson, a tenacious attorney with an honest and blunt relationship with Mack. Colantoni will play Wendell Hicks, Mack’s former accountant hired to run the financial desk at the bail bonds office. Mason plays Mack’s strong and independent mother Lloyd. (The character was written as male/female, with the decision to go with a mother vs. a father made during casting.) Devlin is set to direct the pilot; he and Berg will serve as showrunners and will executive produce with Prendergast, John Altschuler, Dave Krinsky, Tom Lassally and Michael Rotenberg. Davis serves as co-executive producer. Reuben, repped by APA, Estelle Lasher at Principal Entertainment, recently co-starred in Lincoln and will next be seen in comedy Admissions and thriller Reasonable Doubt. She has strong ties with TNT, having co-starred on legal drama Raising The Bar and doing a recurring role on the new season of Falling Skies. Colantoni, repped by Innovative and Vanguard Management, has recurred on Person Of Interest and co-starred in the feature Contagion. Four time Oscar nominee Mason recently recurred on The Middle.