We’ve been given an exclusive peek at the latest trailer for The Wildest Dream, Anthony Geffen’s feature documentary retracing the climb undertaken by British explorer George Mallory in his attempt to be the first man to climb Mount Everest.

The trailer shows off the film’s stunning vistas and features the voices of Liam Neeson, Ralph Fiennes, Alan Rickman and Natasha Richardson in her final film role.

Here’s the synopsis,

THE WILDEST DREAM is a story of obsession and breathtaking adventure, told through the explorer’s poignant and evocative correspondence with his wife and using previously unseen photos and archive footage. Anker and British rock-climbing prodigy Leo Houlding embark on their own quest to conquer Everest, following the original North East Ridge route taken by Mallory in 1924 to discover whether he and fellow climber Andrew “Sandy” Irvine could have reached the summit. In their attempt they must free climb the infamous Second Step, a 90 foot sheer rock wall, just as Mallory and Irvine would have had to do eight decades earlier.

THE WILDEST DREAM is narrated by Liam Neeson and features the voices of Ralph Fiennes as George Mallory, the late Natasha Richardson as Ruth Mallory, Hugh Dancy as Andrew “Sandy” Irvine and Alan Rickman as Noel Odell, the last person to see Mallory alive

Here’s the trailer, and the film opens at the BFI IMAX and cinemas across the UK from 24th September, 2010.