 At the Hub, they find that Jack has deduced that Mary is an alien and the murderer of the skeleton and others through the century.Jack explains that the artefact is a transporter for a guard and a prisoner; when the artefact first arrived in Cardiff in 1812, Mary was able to kill her guard and took the body of a human woman, killing others to keep her human form.Mary holds Tosh at knife point, demanding the artefact.