Benedict Cumberbatch is narrating a new documentary by the great grandson of JRR Tolkien.

There’s A Hole In My Bucket follows Royd Tolkien’s journey to complete a bucket list of 50 challenges created for him by his brother Mike who suffered from motor nerurone disease.

Unknown to Royd, Mike had secretly compiled a bucket list to be delivered to his brother after his death.

The documentary follows Tolkien as he attempts to complete the 50 challenges in New Zealand.

“Benedict was previously aware of my brother, Mike, and his battle with this terrible disease. In 2014 I organised a charity screening of The Hobbit on behalf of my brother, and Benedict joined fellow cast members who kindly recorded greetings for that event,” explained Royd Tolkien.