First broadcast: on BBC One HDLatest broadcast: on BBC Two Scotland
Eight teams race through the world's toughest natural and urban environments. On the beautiful, wild Isle of Skye in Scotland they must cross a lake with a caber. Show more
First broadcast: on BBC One HDLatest broadcast: on BBC One Wales
Steve Jones presents as teams race through the world's toughest natural and urban environments. The second drop zone is 2,000 metres above sea level, in the Austrian Alps. Show more
First broadcast: on BBC Two ScotlandLatest broadcast: on BBC One Wales
Travel adventure series. The six remaining teams land on the Greek island of Milos, where the relentless heat and harsh terrain make the challenges seem even tougher. Show more
First broadcast: on BBC Two ScotlandLatest broadcast: on BBC One Wales
Travel adventure series. The five remaining teams race through the complex maze that is the streets of Istanbul, the fifth largest city in the world. Show more
First broadcast: on BBC Two ScotlandLatest broadcast: on BBC One Yorkshire
Travel adventure series. Tension mounts as the remaining four teams put their map-reading skills to the test as they try to navigate through the dense Thai jungle. Show more
First broadcast: on BBC Two ScotlandLatest broadcast: on BBC One Yorkshire
Travel adventure series. Steve Jones welcomes the last three teams to the final where they have to combat the chaotic streets and navigate the remote backwaters of Vietnam. Show more