Tim Emmett will join Dave MacLeod in the televised climb
Two climbers are to make a live televised ascent of what they have described as one of the toughest rock faces in the world.
Dave MacLeod and Tim Emmett will tackle Sron Ulladale, an overhanging cliff on Harris in the Western Isles.
The climb on 28 August will be filmed in high definition (HD) and broadcast on BBC Two Scotland and BBC HD Channel.
A previous live event - The Great Climb - in the Cairngorms in 2007 was abandoned because of heavy rain.
Triple Echo - which produces BBC Scotland's Adventure Show - said the Sron Ulladale climb will be a world first in the terms of technology used during the outside broadcast.
In February, Mr MacLeod and fellow climber Andy Turner recreated the most famous series of ascents in Scottish winter climbing, on Ben Nevis.
The pair retraced Jimmy Marshall and Robin Smith's first ascents of six routes in winter conditions made in a week 50 years ago.
Mr Emmett is an extreme sports athlete and climber.
Permission for this summer's programme was granted on the basis that the producers agreed a "leave-no-trace" commitment to protect the fragile local environment.
Most of the equipment will be flown in to prevent any erosion to the mountain trails and rare plant life.
Triple Echo said it was working closely with the North Harris Trust.
Dougie Vipond, who will present the broadcast, said: "This is set to be one of the most inspiring films ever produced of climbers in action.
"It will be a hugely challenging and bold ascent and our cameras will be there to capture all the drama as it happens."
Dave MacLeod was involved in The Great Climb
The programme will also feature a world record attempt the two climbers will make earlier in the summer.
They plan to ascend five new routes on five islands in five days.
Writing on his blog, Dave MacLeod said: "I'd love to tell you exactly which part of the mighty Sron we will try to climb, but last week on our recce, close inspection of the cliff was out of the question due to the golden eagles, nesting on the main part of the face once again.
"If the eagles hatch chicks (best of luck to them!) we won't be able to look closely at the lines until August. So until then, it's training and waiting. Naturally, our plan is to climb the hardest possible route that imagination and finger strength allows."
In 2007, BBC Scotland's ambitious outside broadcast The Great Climb was called off.
The production team cancelled the six-hour show after persistent rain led to dangerous conditions.
BBC Scotland said it was very sorry it had to abandon the venture, but that the risks were "too great".
The planned live broadcast from Loch Avon basin in the Cairngorms National Park was being produced by Triple Echo and featured Mr MacLeod.
Eight of the world's top climbers were to attempt testing routes on the imposing Shelter Stone and Hell's Lum crags.
And the broadcast was scheduled to climax with Mr Macleod trying to get himself up a difficult new route on Hell's Lum.