The presenters look back at some of the amazing dens from series one and two. Here, Lauren revisits the survival, art, Hollywood cinema and DJ dens.

The presenters look back at some of the amazing dens from series one and two. Here, Lauren revisits the train, magical library, community and plane dens.

Helena needs a den to help her reach for the stars and fulfil her science dreams.

Will needs a rugby den to keep him in the game.

Joe and Lauren help build a den for the children and their siblings at Claire House Children's Hospice in Liverpool.

Ocean loves marble runs because they're like rollercoasters and one day he'd like to be a rollercoaster designer. He wants a marble run den.

Astrid needs a Christmas den so she can enjoy that special day all year round.

Brothers Alec and William want a den that looks like a traditional Scottish castle.

Nine-year-old Nya really needs her own space to indulge her love of martial arts.

Nine-year-old Kiran wants somewhere he can let his love of witchcraft and wizardry come to life.

Eleven-year-old Cammy, who is one of six siblings, needs a place where he can be on his own, in calm and quiet.

Nine-year-old Maddie needs a space of her own where she can focus on her sporty future.

Joe and Lauren look back at all the amazing dens built throughout the series. They reminisce about the great kids, the tense surprises, and the big reveals.