A Blue Knight at the Opera - S1.E6

When the opera is plagued by numerous accidents, the team is called to protect opera singer Mademoiselle Diva. Mahoney's advances are rejected, as Diva is enamored with Tackleberry instead. During a performance attended by the Police Chief, Diva is kidnapped by the Phantom of the Opera. Lassard and House try to cover, making their stage debuts in the process.