A video showing "Mr Doodle" at the start of a 50-hour challenge to doodle all over a gallery in Carnaby Street, London.
Mr Doodle has made a name for himself by covering the entire interiors of buildings with his distinctive doodles.
This project, which is at the We Built This City Gallery, will raise money for The Teapot Trust, which uses art therapy to help children with chronic diseases.