The team descend on Swansea to build a centre and supported housing for young people in care and leaving care. This special episode shares the stories from some of Wales's most vulnerable young people as well as the founder of the Roots Foundation Wales, a charity part-funded by BBC Children in Need that supports young people in and leaving care.

DIY SOS is back on veteran street in Manchester to build the final home on the road for a decorated former soldier and his young family.

Two years ago, with the help of Prince William and Prince Harry, DIY SOS launched their most ambitious project yet - transforming a derelict street into a vibrant community for veterans and local people, creating new homes and a veterans' support centre.

Now, with the project almost complete, Nick Knowles and the team return to build the last remaining home for amputee and single dad Simon Flores, whose foot was blown off by a roadside bomb during a patrol in Iraq.

The DIY SOS team and volunteers in Bristol help to transform the home of 24-year-old Ryan, who has spent the last five years in hospital 50 miles away from his family, after a CT scan revealed that a build-up of fluid and pressure had caused brain damage. His devoted mother Rachel has spent the last five years commuting on public transport to see her son, and the family is torn apart. In order for Ryan to return home, the house needs a downstairs extension with all the bespoke care provision that Ryan will need: physio space, wet room, family space and the ability to access the entire ground floor. If the family does not get this work done, Ryan will remain in hospital.

In Shropshire, three amazing school children and an energetic head teacher inspire the DIY SOS team and hundreds of volunteers to help 12-year-old Matthew return home from hospital for the first time in three years, after suffering cancer and a stroke. Matthew has yearned to return home, but as his house is completely unsuitable for his complex medical needs and equipment, he is stuck in hospital. His schoolmates fundraised wherever they could and campaigned to get Matthew home. Now the DIY SOS team join their crusade. With a Doctor Who-inspired interior design, enormous community spirit and the power of friendship, this is a DIY SOS Big Build to inspire.

Kidney failure has meant that midwife Sascha has to endure intensive dialysis at hospital just to stay alive. This intense dialysis for hours on end, five days a week, places her body under immense stress with the constant threat of life-risking blood clots. If this continues, Sascha, a mother to four children, has a life expectancy of just a few years. However, Sascha could do self-dialysis daily from her home, and the increase in frequency and the decrease in intensity would mean her life expectancy and lifestyle would improve dramatically. So that is where DIY SOS and the generous volunteers and trades of Billy's home turf, Welwyn Garden City, step up to help one of their own. In an emotionally charged episode, Sascha's family home is completely renovated and extended to include a dedicated home-dialysis room for Sascha, which offers her a lifeline and extra years with her loving family.

On the Isle of Sheppey in Kent, Garry and Kyle first fostered then adopted four vulnerable children because they wanted to give them the best life possible. Unfortunately their tired, crammed three-bed bungalow now threatens their family's future. Nick Knowles and the team take on a DIY SOS first - and one of their most ambitious home builds ever. The team are going to demolish the bungalow and in just nine days build an entirely new bespoke five-bedroom home for this inspiring family.