is a triple BAFTA Award–winning British game show which first aired on ITV on 22 August 2009. Presented by Phillip Schofield, it offers contestants the chance to win a top prize of £250,000 by completing challenges from within a 4m × 4m × 4m Perspex cube. The show is based on the idea that even straightforward tasks become extremely challenging when confined and put under pressure in front of a large live studio audience. Once inside, contestants can feel both claustrophobic and disorientated. Using "state-of-the-art filming techniques", the show aims to demonstrate the intense anxiety which contestants undergo as they progress through each task. Colin McFarlane provides the disembodied voice of , who explains the rules of the games.

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