In this festive special, a bemused Richard Ayoade guides a celebrity team of haplessly enthusiastic adventurers around a special panto-themed Maze. Captaining the team is Christopher Biggins, leading Deborah Meaden, Jamie Laing, Frankie Bridge and Chris Kamara with some surprising celebrity cameos and a pantomime cow along the way.

This episode's team are The Science Nerds, proving that putting the words 'science' and 'nerds' in the name of your team isn't necessarily a guarantee of competence. Richard Ayoade oversees the antics.

Today's team are called The Vikings because they spend most of their spare time living like Vikings! As they travel through the Aztec, Futuristic, Medieval and Industrial zones they'll learn the answer to the question: 'can you ever have too much testosterone in a room'?

Richard Ayoade guides the Let's Get Medical team - a group of medical students - in this week's challenge. They may be used to studying the complexities of the human body, but the pressure of the mighty maze can turn even the brightest minds to mush.

Maze master Richard Ayoade leads the Holmes family around the maze as they attempt to win precious crystals and not have a major falling out.

It takes self-belief, attitude and quick wits to conquer the Maze. Tonight's team, The London Girls, are overflowing with two of the three qualities. Will Maze Master Richard Ayoade ever be able to keep control of this calamitous and kamikaze bunch?

Richard Ayoade guides everyday adventurers hoping to make it to the Crystal Dome. Will a team comprised of people paid to play computer games for a living be able to nerd their way to victory?