The team must face hippo and lion attacks on the Namibian border and an endless trek in unforgiving heat.

The team become the first group ever to walk through Etosha Game Reserve and come face to face with wild animals.

In the final leg, the team face the toughest part of their journey - crossing the burning and mountainous sand dunes of the world's oldest desert.

A 220-mile trek across Nicaragua - and all 11 trekkers have a physical disability. Teamwork is the key - but just 15 miles in, there's an unexpected problem.

The team face bandit country, crocodile-infested waters and a seemingly endless trek in an unforgiving 40°c heat. But each of the participants is facing additional challenges.

Ten disabled teenagers attempt the journey of a lifetime, trekking over 300 kilometers from the Amazon rainforest and climbing the mighty Andes Mountains. Show more

The team has reached the Andean plateau, but more challenges lie in wait. And for the youngest members of the team, this will be the most testing part. Show more

Documentary. Ken Hames catches up with the disabled team members from the second and third series of Beyond Boundaries after their adventures in Southern Africa and Ecuador. Show more

At the close of the trek, the Pacific is almost in sight - but before the team swim in the ocean, they must climb Mount Concepcion, a 5,500ft live volcano.

The adventurers are beginning to really feel the strain. Horseback is the required mode of transport, then the team sail to their final challenge: to climb a 5,500ft live volcano.

Documentary. Ten disabled teenagers attempt the journey of a lifetime. As the team ascends above 3000m the thin air takes its toll. Not everyone will succeed. Show more

Documentary. Expedition leader Ken Hames finds out what has happened to the disabled team members from the first series of Beyond Boundaries since their Nicaraguan adventure. Show more

Eleven people embark on an arduous trek across Africa. The journey begins with an endurance test against the world's most dangerous rapids.

The final stretch awaits the team and the realisation that their experiences have wrought profound changes in their outlook and attitudes begins to hit home. Show more