

A storm sweeps in and an entire family disappears, eight-year-old twins, their parents and their grandparents, all separated and all unaccounted for on an exposed mountain.

An 80-year-old woman is stranded 100 metres down a cliff on Yr Wyddfa with no safe way to reach her.

Deep in the remote Glyderau mountains, a rock crushes a man's leg and his friend faces an agonising decision, stay by his side or go for help; an injured woman is found on the hillside but fights every attempt to carry her to safety; and a father and son, lost in thick mountain mist, get an unexpected lifeline from a stranger passing at just the right moment; three different rescues, each one pushing the teams in different ways.

Rescuers are searching for an injured man who may have taken hallucinogens, someone with no sense of the danger he is in and no ability to help himself be found; two climbers are trapped on a sheer ledge with darkness closing in and no torches between them; and a family takes a wrong turn on one of Wales' unforgiving peaks, turning a day out into a frightening ordeal; the teams have seen a lot, but tonight throws them something different.