Andrew Flintoff hosts the action-packed game show, in which 24 contestants are tasked with traversing a series of water-based challenges and custom-made inflatable obstacles, each designed to test their speed, accuracy, height and distance. The most successful contestants then claim a chance to launch themselves `cannonball-style' at a moving target on the surface of a deep-water tank, all in the hope of nabbing the show's `priceless' Cannonball Cup.