Celebrity SAS: Who Dares Wins for Stand Up to Cancer - Season 4

Actors Maisie Smith and Jennifer Ellison, entrepreneur Calum Best, Olympic medallist Fatima Whitbread, reality TV stars Pete Wicks and Ferne McCann, ex-footballer Ashley Cain, influencer Amber Gill, dancers AJ Pand Curtis Pritchard, Olympic sprinter Dwain Chambers, taekwondo Olympic gold medallist Jade Jones, boxer Shannon Courtenay, and Paralympic high jumper Jonathan Broom-Edwards take part in a special edition of the training challenge. In the first episode, the recruits must crawl through sand in blistering 40-degree heat, before facing every desert soldier's worst nightmare - a gas attack.

The celebrity recruits face a series of trust exercises, including jumping from a helicopter in pairs before working together to get to shore. However, when some of the group lose equipment and fail to keep their kit dry, all the recruits are punished for the mistake. Jennifer Ellison and Ferne McCann have to overcome their trust issues and self-doubt to freefall from a 150-foot cliff.

Twelve celebrity recruits remain from the original 14. Entering the next phase, the celebs face a series of tasks that will test their resilience to the max. In teams led by the fiercely competitive brothers Curtis and AJ Pritchard, they take on the gruelling task of moving a broken-down one-tonne Jeep to a safety zone over half a kilometre away - in searing heat and through thick sand. After being banned from athletics for using performance-enhancing drugs, ex-sprinter Dwain Chambers is eager to impress the DS as the celebrity recruits are tasked with balancing on ropes 160ft above the ground to cross a ravine.

Shannon Courtenay comes face-to-face with her anger issues, and Ferne McCann confronts her fear of the dark when the recruits are forced to dive backwards from a seven-metre platform into the waters of the Gulf of Aqaba in the dead of night. At the end of the episode, the DS drop two recruits from the training program.

Chief instructor Rudy Reyes puts Ashley Cain and Maisie Smith to the test, challenging them to get all their equipment across a body of water by zipline, without it getting wet. Finally, back in the blistering heat of the Jordanian desert, two teams of recruits must work out how to load and pull a 200kg sled loaded with equipment up a narrow ravine.

The celebrities face the penultimate survival phase of the course, where they prepare for life on the run behind enemy lines. An ambush triggers traumatic memories for AJ Pritchard. Messages from home threaten to unsettle the recruits ahead of the escape and evasion phase, while Calum Best leads his team astray as they try to avoid capture by a relentless Hunter Force.

The seven celebrity recruits face the final and most brutal phase of the course. Captured by the Hunter Force while trying to escape, they're questioned by a specialist team of interrogators with over 40 years of experience in war zones. The recruits must keep to their cover story, while subjected to punishing interrogation techniques, including ice baths and being buried in a box in a bid to force a confession.