Series 1 Episode 4
First Broadcast: 9PM Tue 3 December 2013

The final episode focusses on the challenge of keeping audiences coming year after year, once the glitz and glamour of opening night have been and gone.

Running costs on even a medium sized show can be more than a quarter of a million each week and a near-constant stream of audiences is required to fuel the machine.

Key to keeping these shows fresh are the performers who replace existing cast at the end of their contracts.

Andrew Derbyshire is hoping to land a year-long contract in Thriller Live. Ten years ago, fresh out of college, Andrew had lead roles in Joseph and We Will Rock You, but in recent years he's been doing regional tours and is desperate to get back into the West End. He has just three weeks to impress the producers.

Across town, Top Hat is in its second year in the West End and must keep pulling in the crowds if it's to stay there. There's good news as it scoops seven nominations for the Olivier awards. The team have also been asked to perform on the live awards show to an audience of millions, a unique opportunity to boost ticket sales.

Back at Thriller, auditions are underway to find a new batch of performers to play the role of the young Michael Jackson in the show. These boys are so hard to find that they also run a Michael Jackson Academy, where young hopefuls learn singing, dancing and moonwalking.

Thirteen-year-old Kierran auditions and is good enough to go straight into the show, but can he overcome his shyness?

Will Andrew make the grade and join Thriller? And there's good news and bad news for Top Hat.

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An unprecedented look behind the scenes of the cut-throat world of West End musicals