Guest Stars Bruce MacKinnon as Sir Arthur Conan Doyle Anthony Stewart Head as Alexander Graham Bell Charlotte Ritchie as Herself Catherine Tate as Elsie Wright Mathew Horne as Frances Griffiths Alexander Kirk as Arthur Wright Mathew Baynton as Antonio Meucci Nish Kumar as Himself Matthew Steer as Edward Gardner Tim Key as Thomas Edison Tom Stourton as Thomas Watson Kath Hughes as Polly Wright James Meehan as Theosophist