Filming has now started on the special celebrity edition of The Crystal Maze being made for C4's Stand Up To Cancer season.

New host Stephen Merchant is pictured here on the set with contestants Josh Widdicombe, Rio Ferdinand, Michelle Keegan, Jonnie Peacock and Sara Cox. His shaved head might look like a homage to previous host Richard O'Brien, but he actually shaved it for his forthcoming role in Wolverine 3.

The special edition is being filmed at The Crystal Maze Experience in London and will see the five celebrities take on the Aztec, Medieval, Futuristic and Industrial zones before sending them in to face the fans in the iconic Crystal Dome.

The Crystal Maze special, sponsored by BT, will form part of a wider season of Stand Up To Cancer (SU2C) programming on Channel 4, including the four-part celebrity series of The Island with Bear Grylls, sponsored by Scottish Power. Stand Up To Cancer is a joint national fundraising campaign from Cancer Research UK and Channel 4.

The puzzle-solving cult classic was formerly hosted by Richard O'Brien and Ed Tudor-Pole and was last broadcast on C4 in 1995.

The episode will be broadcast on C4 on October 16 at 9pm.