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Gary Lineker puts ten celebrities to the test in a challenge competition with a twist - there are no rules and no instructions.

True colours emerge as the celebrities face individual and team challenges. A mystery box offers an advantage, but two face the Duel and only one can survive.

Mind and body are tested as celebrities tackle terrifying challenges. Who will keep their nerve and escape the Duel?

The time for friendship is over as mistrust spreads, sabotage is suspected and a familiar face returns to shake up the game.

As the celebrities continue their voyage into the unknown, risks are rewarded, a mystery box returns and one decision sends shockwaves through the group.

An exasperating challenge sparks conflict and chaos, and tempers flare as accusations fly, with a once-solid friendship being pushed to breaking point. With tensions still simmering, the celebrities are thrown into an anxiety-inducing setting and tested under watchful eyes, and with just five determined contenders left fighting for a place in the semi-final, the stage is set for a tense, giant-killing Duel.

Four celebrities remain and with a place in the final within reach, everyone has their eye on victory. While no one can predict where the box doors will open next - one celebrity is brimming with confidence, while another is offered a chance to take revenge. Gary Lineker continues to throw them into increasingly bizarre worlds, and this time unsuspecting members of the public become part of the game. One more celebrity face elimination and with that, the three finalists are revealed.

Gary Lineker hosts as the three finalists battle it out to be crowned the winner, with the remaining celebrities facing a trio of high-stakes challenges. With no margin for error, they must try to outsmart the Box and stay in contention, with everything coming down to one last unforgiving duel.