BBC One follows Radio 2 DJ Sara Cox as she pushes her limits to complete the Great Northern Marathon Challenge, raising funds for BBC Children in Need.
Over five grueling days, Sara must carry Pudsey bear on her back and trek 135 miles through the wild Northumberland National Park, climb into the Pennines, and cross Yorkshire to bring Pudsey back to his hometown of Leeds.
Facing rural terrain, weather extremes, and unexpected challenges, Sara runs, walks, or crawls her way with support along the path, driven to finish the epic journey for a worthy cause.
"Sara has accepted the most physically demanding challenge of her life to raise money for the vital projects that BBC Children in Need funds all across the UK."
The cameras document every exhausting step as Sara digs deep to cross the finish line and deliver her special package.
Sara Cox undertakes a tough 135-mile marathon carrying Pudsey bear, highlighting her dedication to raising funds for BBC Children in Need across the UK.