Reba McEntire will be joining the cast of the ABC crime drama Big Sky. She'll play the role of Sunny Brick, the matriarch of the Brick family. Big Sky was created by David E. Kelley and is based on The Highway book series by C.J. Box. The story follows a pair of detectives who go looking for two sisters who have been kidnapped along a remote Montana highway, and soon uncover a much larger mystery.