Deadline reports of a new project for our dear Goddess of Acting, Mary McDonnell.

ABC is rounding out its recurring cast for its new Katey Sagal-starring series Rebel. Mary McDonnell, Adam Arkin, Matthew Glave and Jalen Thomas Brooks have joined the cast of the series created by Krista Vernoff inspired by the life of Erin Brockovich today.

Rebel centers on Annie “Rebel” Bello (Sagal), a blue-collar legal advocate without a law degree. She’s a funny, messy, brilliant and fearless woman who cares desperately about the causes she fights for and the people she loves. When Rebel applies herself to a fight she believes in, she will win at almost any cost.

Andy Garcia and Lex Scott Davis also star and Dan Bucatinsky recurs.

McDonnell will play Helen. Inspired by Rebel, Helen doesn’t let her own illness define her as she and her daughter fight for their lives and for justice.

Arkin, who also executive produces and directs the series, will play Mark Duncan, a silver fox, he is the CEO of the Stonemore Medical Corporation. He markets himself as an altruist and a philanthropist and strongly reflects Rebel’s assertion that his heart valve is doing harm.

Glave will portray Woodrow Flynn, a beat cop who sometimes helps Rebel in her work; he was Rebel’s first husband and is Nate’s father.

Brooks will play Sean, a sexy bad boy who is a member of Ziggie’s Narcotics Anonymous group, Sean is pretty obviously into her — even though they both know it’s a bad idea to date in the first year of recovery.

The series hails from Davis Entertainment, Sony Pictures TV and ABC Signature.

McDonnell is best known for her Oscar nominated performances in Dances With Wolves and Passion Fish, as well as her role as President Laura Roslin in the Peabody-winning Battlestar Galactica. She earned two Emmy nominations for her portrayals as Captain Sharon Raydor in TNT’s The Closer and as Eleanor Carter in NBC’s ER. McDonnell is repped by Anonymous Content, Innovative Artists and Jackoway Austen Tyerman.