Stephen Merchant welcomes a team of celebrities to this special edition of the legendary game show in aid of Stand Up To Cancer. Rio Ferdinand captains an all-star line-up featuring Michelle Keegan, Jonnie Peacock, Sara Cox, and Josh Widdicombe. The team of five stars take on the Aztec, Medieval, Future and Industrial zones, attempting a variety of skill, mental, physical and mystery games. Each game could earn the team a crystal, with each crystal awarding the team crucial time for their ultimate challenge...The Crystal Dome.Inside The Crystal Dome the team attempt to collect gold tokens, which will be converted to money in the hope of winning a huge cash prize for Stand Up To Cancer.