Twelve-year-old Luke is passionate about black history and wants people to realise how important it is.

Ten-year-old Caitlin wants to become a conservationist when she's older. She is passionate about teaching other people how important our world is, and needs a den where she can research.

11-year-old Maariya was scared of going underwater but overcame her fear a few years ago. Now she loves swimming, snorkelling and all things underwater.

Eight-year-old Nathan loves learning all about the rainforest from his dad and wants a den so he can feel like he is deep in the Amazonian rainforest every day.

Becca and her twin brother, Charlie, loved their new chinchillas. However, one of them was pregnant and gave birth and the only way to save them from being rehomed is to have a chinchilla den.

Twelve-year-old Ashley needs an opera-themed den so he can sing to his heart's content. He has Tourette syndrome and singing helps him to overcome it.

Eight-year-old Mei is half Japanese and loves learning more about Japan's culture. She doesn't get to visit as often as she would like so needs a den where she can celebrate her Japanese heritage.

Nine-year-old Jothi had an illness as a baby that caused his legs to not grow properly, meaning he can't visit his favourite crazy golf course. Jothi needs a crazy golf den he can access all the time.

11-year-old Holly has chronic actinic dermatitis, eczema caused by UV light, and needs a calm and relaxing den to help forget about it.

Ten-year-old Evie wants a den where she can spend quality time with her aunt, whose chronic rheumatoid arthritis means she is unable to get up the stairs to Evie’s room.

Eight-year-old Matthew needs a den so he can teach his sister the board games he has grown to love.

Ten-year-old twins Becca and Lottie need a den so they can enjoy wildlife and bugs together. Becca has cerebral palsy and her wheelchair makes it difficult to play in the garden with her sister.

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

Joe and Meryl look back at some of the amazing dens from this series and catch up with our Dengineers to see how the dens have changed their lives.

Joe revisits the Queen Victoria, Australia, Sewing and Army Coding Dens.

Ten-year-old Florence from Oxfordshire wants a cool hotel den so that she can relax, hang out with friends and be on holiday whenever she wants.

Doctor Who fan Adam wants a den where he can celebrate his favourite TV show and pursue his passion for drama.

Vilonu is a huge CBBC fan and dreams of becoming a TV presenter when she is older. She wants a space where she can write, film and edit her very own TV shows.

Gregor from Aberdeenshire needs somewhere to practise, store and maintain his bagpipes. He dreams of becoming a professional, but his pipes are too loud for the rest of the family.

Amayah from Sheffield is a huge fan of the weather and dreams of becoming a forecaster. She wants a den where she can study the weather and create her very own forecasts.

Ciarän from Barnsley is passionate about engineering and vacuum cleaners. He wants a den where he can create his own inventions, understand how things work and share his knowledge.

Twelve-year-old Annabell loves the seaside but lives in Milton Keynes, miles from the coast. She would like her very own beach den where she can spend time with friends and relax.

Stan from Cumbria is a talented artist and a huge fan of comics. However, he has nowhere to draw and needs a den to work on his illustrations and display his art.

Twelve-year-old Amelia from Glasgow has family ties to Australia, the USA, China and Hong Kong, and she wants a den where she can celebrate her diverse international heritage.

Ollie wants a lucky cat-themed den where he can relax, hang out with his favourite feline Graham and work on his very own comic stories.

Lydia from County Durham is passionate about the ancient Egyptians and wants an appropriately themed den where she can learn more about this fascinating period from the past.

Joe and Meryl take a look back at some of the amazing dens from past series and catch up with some of our Dengineers to see how the dens have changed their lives.

Joe and Meryl take a look back at some of the amazing dens from past series and catch up with some of our Dengineers to see how the dens have changed their lives.

Joe and Meryl take a look back at some of the fun moments and amazing dens from the series.

Ballroom dancer Harry from Dudley is a huge fan of Strictly and wants a den full of glitz and glamour to help him practise his dancing and store his trophies.

Bea from Hull and her best friend Stanley the sausage dog are seriously short of space. They need a den where they can learn new tricks and hang out together.

Siblings Nethuni and Abheetha are obsessed with optical illusions and want a den where they can work together to create new tricks to dazzle their friends.

History buff Hector from Wigan is a huge fan of William Shakespeare. He needs a space of his own where he can enjoy his hero’s works and write plays.

Angel from London is a top tap dancer who needs a space of her own where she can train properly, store her costumes and display all of her medals.

Duncan from Glasgow is passionate about protecting orangutans. He needs a den where he can learn more about these primates and how to help them, and share his passion with friends.

Zoe from Oxfordshire is mad about science and desperately wants a den where she can pursue her passions and carry out noisy, messy experiments whenever she wants.

Keir from Rugby is a massive fan of rollercoasters. He wants a den where he can celebrate his passion, design his own coasters, and share his love of rides with friends.

Avanaya from Leicester wants a relaxing, Indian-themed den so that she can escape her three cricket-loving brothers, and to remind her of the special times she has spent visiting her grandma in India.

Goalkeeper and football fan Tristan had to take a break from playing with his local team due to illness. He wants a den to help him recover and to store all his football memorabilia.

Emily is crazy about crochet and her crafty creations are taking over the house. She needs a space where she can crochet, store all her woolly wonders and hang out with mates.

Sea cadet Jonny became fascinated with naval history through his grandad and is now a huge fan. He wants a submarine-themed den where he can celebrate his passion, learn more and enjoy hanging out with mates.

Joe and Meryl take a look back at some of the fun moments and amazing dens from the series.

Joe and Meryl take a look back at some of the amazing dens from the series and catch up with some of our Dengineers to see how the dens have changed their lives.

Joe and Meryl are joined by the Dengineers Designers to give a masterclass on creating your own dream space.