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The Joseph finalists have been given their hardest task ever this week - being banged up in London's oldest jail.
Lewis, Ben, Keith and Lee were locked up for three hours in a tiny cell in Clink Prison to prepare them for the show's dungeon scene.
The infamous 12th century jail housed murderers and heretics but is now a museum. After the ordeal, the four contestants performed Close Every Door in front of Andrew Lloyd Webber.
In the show, Joseph is thrown into jail after Egyptian millionaire Potiphar catches him with his wife.
The four remaining Josephs will battle it out in Saturday's final.