Modest Mussorgsky's opera in prologue and four acts is performed by the famous Bolshoi Opera, at the Bolshoi Theatre. Boris Godunov has obtained the throne of Russia by murdering the rightful heir Dmitry. An old monk, Pimen, witnessed this, and convinces his apprentice Grigory to avenge Dmitry's death. In the following years Grigory poses as Dmitry, raising an army against Boris, who is now convinced that he is being punished for the murder.