It's 1884 London and two of the theater's most respected artists, William Schwenck Gilbert (JIM BROADBENT) and Arthur Sullivan (ALLAN CORDUNER), have hit a creative roadblock. Despite a successful and near decade long collaborative track record of entertaining theatergoers, their latest opera, "Princess Ida," is receiving lukewarm reviews and a summer heat wave has cut into their business at the Savoy Theater where it's staged.
That troubles both Richard D'Oyly Carte (RON COOK), the impresario who oversees both the theater and its troupe -- including Gilbert and Sullivan -- as well as his assistant, Helen Lenoir (WENDY NOTTINGHAM). For not only are box office returns dwindling, but Sullivan, the composer of the duo, feels that his work has become stagnant and wants to move on to more serious musical pieces.
Unfortunately for him, he and Gilbert, the lyricist, are contractually obligated to deliver another opera for the Savoy, and he isn't motivated by his collaborator's latest effort. Things appear to be at an impasse until Gilbert's wife, Kitty (LESLEY MANVILLE), drags him to a Japanese exhibition. Suddenly inspired by a different culture, Gilbert begins to write "The Mikado," an opera that similarly sparks the creative juices in Sullivan.
Soon the two begin working with the Savoy's regular cast that includes veteran performer, Richard "Dickey" Temple (TIMOTHY SPALL) and lead actress Lenora Braham (SHIRLEY HENDERSON), as well as Durward Lely (KEVIN McKIDD), Jessie Bond (DOROTHY ATKINSON), George Grossmith (MARTIN SAVAGE) and Rutland Barrington (VINCENT FRANKLIN), as well as Mr. Seymour (NICHOLAS WOODESON), the stage manager, and John D'Auban (ANDY SERKIS), their choreographer.
As the days count down toward their opening and with encouragement from Kitty and Fanny Ronalds (ELEANOR DAVID), Sullivan's mistress, the excited, nervous and worn out duo, along with their cast and crew, continue rehearsing in hopes that their latest opera is a creative and financial hit.