Five-time Tony winner McDonald will portray Mother Abbess with Benanti as Elsa Schrader and Borle as Max Dettweiler.
As previously reported, six-time Grammy Award winner Carrie Underwood is set to star as Maria with Stephen Moyer as World War I hero Capt. Georg Von Trapp. The three-hour production will be based on the original 1959 Broadway musical, which starred Mary Martin and Theodore Bikel.
The presentation will be produced by Universal Television.