Airs Saturday, February 14, at 12 noon. The 2014-15 Metropolitan Opera Radio Broadcast season continues with a live broadcast of a new double bill: Tchaikovsky’s romantic fairy tale Iolanta, with soprano Anna Netrebko in the title role of a blind princess, tenor Piotr Beczala as Vaudémont, a knight who falls in love with her, and baritone Aleksei Markov as Robert, her fiancé; and Bartók’s harrowing Bluebeard’s Castle, with soprano Nadja Michael as a bride who discovers the terrifying truth about her new husband, sung by bass Mikhail Petrenko. Valery Gergiev conducts both operas. This production, by Mariusz Trelinski, marks the company premiere of Iolanta, Tchaikovsky’s final opera, as well as the Met’s first-ever staged performances of Bluebeard’s Castle in its original Hungarian. Iolanta/ Bluebeard’s Castle will be heard live over the Toll Brothers-Metropolitan Opera International Radio Network at 12:00 p.m. CT on Saturday, February 14.