Tatiana Maslany Joins HBO's 'Perry Mason' Cast!

Tatiana Maslany is joining Perry Mason!

The 33-year-old Orphan Black actress has signed on for the lead role of the upcoming HBO series, Deadline confirmed on Friday (April 12).

Matthew Rhys will also star in the series.

Perry Mason follows the origins of American fiction’s most legendary criminal defense lawyer (Rhys). When a child kidnapping case breaks down his door, Mason’s relentless pursuit of the truth reveals a fractured city and just maybe, a pathway to redemption for himself.

Tatiana will play Sister Alice, the leader of the Radiant Assembly of God, preaching three sermons a day to a hungry congregation and a radio audience that spans the country. An entertainer, politician, God’s conduit to the City of Angels, Sister Alice wields great power when she speaks, and plans to use it in ways only she can know.