Casting News: 'Orphan Black' Star Tatiana Maslany Joins New 'Perry Mason' TV Series

Exciting news for Orphan Black fans: Tatiana Maslany is returning to TV with a lead role in HBO's upcoming Perry Mason series.

According to Deadline, Maslany has been cast as Sister Alice, the leader of the Radiant Assembly of God, a charismatic preacher who wields great power in early '30s Los Angeles where the limited series is set.

She joins former The Americans star Matthew Rhys, who will take on the iconic title role made famous by Raymond Burr in a popular '50s-'60s TV series and subsequent run of TV movies. Created by Erle Stanley Gardner in a long-running series of detective novels, Perry Mason is a criminal defense lawyer who has a gift for establishing his clients' innocence.

The limited series is being produced by Robert Downey Jr. and wife Susan Downey. HBO's official logline teases: "1932, Los Angeles. While the rest of the country recovers from the Great Depression, this city is booming! Oil! Olympic Games! Talking Pictures! Evangelical Fervor! And a child kidnapping gone very, very wrong! Based on characters created by Erle Stanley Gardner, this limited series follows the origins of American Fiction’s most legendary criminal defense lawyer, Perry Mason. When the case of the decade breaks down his door, Mason’s relentless pursuit of the truth reveals a fractured city and just maybe, a pathway to redemption for himself."

Perry Mason marks Maslany's first series regular role since her Emmy-winning performance in BBC America's Orphan Black, which ran for five seasons from 2013-17.

She's since appeared in movies including Destroyer opposite Nicole Kidman and Pink Wall, an upcoming romantic drama directed by her partner, Downton Abbey actor Tom Cullen.

She's currently treading the boards on Broadway opposite Bryan Cranston in playwright Lee Hall's stage adaptation of classic '70s movie Network.

Are you excited to see Tatiana Maslany as Sister Alice?