Plot: Mussorgsky's "Boris Godunov" stars bass René Pape as the 16th-century Russian tsar whose reign is challenged by a novice monk (Aleksandrs Antonenko) masquerading as the dead Tsarevich Dimitri, whose murder opened the door for Boris' ascension. The cast also includes mezzo-soprano Ekaterina Semenchuk as Princess Marina, bass-baritone Evgeny Nikitin as Rangoni and bass Mikhail Petrenko as Pimen