David Walliams reflects on great grandfather’s past (Picture: BBC)

Who Do You Think You Are? left viewers all emotional as tonight’s episode saw David Walliams take a deep dive into his great grandfather’s ‘terrifying’ past.

The Britain’s Got Talent star adopted a whole new domineer than the comedian we know and love, as he researched his dad’s grandfather John George Boorman, who was admitted to an asylum with shell shock after fighting in the First World War.