Facing jaw-dropping surprises and creative challenges, a team of dedicated experts is building out-of-this-world dens for children.

Eleven-year-old Ben loves all things outdoors, so a camouflaged adventure bunker complete with a bug kitchen and secret entrance would be the perfect way to make new friends.

Survival Den

Sibling rockers Sami and Nadia are constantly making noise. The only thing they agree on - is the need for their own soundproofed rehearsal room. A massive music amp in the corner of the garden could provide the perfect solution.

Music Den

Due to an undiagnosed illness, Billy missed out on football training for years. A massive Manchester United fan, he needs a purpose-built football den to help get him back up to speed.

Football Den

With bikes being kept in every room in the house - including her bedroom, Ella's dream den is a Hawaiian beach hut where she can escape.

Hawaii Den

Best friends Jazz and Katelyn love dancing and want to put a dance studio in Jazz's mum's cellar.

Dance Den

Eleven-year-old Nathan wants to be a chef and is after a kitchen hangout where he has space to practise his own culinary creations.

Kitchen Den

Nyobi needs more room, a proper desk space, and better materials to work on her art and design projects.

Art Den

Ten-year-old Ben is desperate for a den with enough space for his beloved train set.

Train Den

Sienna really needs a new bedroom, which can double up as a spy den, with lots of techy gadgets inside her top-secret lair!

Spy Den

The pupils of the Lancasterian School, all with complex medical conditions, need an exciting wheelchair-accessible outside space.

Community/School Den

Presenters Mark and Lauren look back at all the dens they built and reminisce about the great kids they encountered.