Mason was a police officer from Montgomery, Alabama in 1955.

He visited the Thirteenth Doctor, Graham O'Brien, Ryan Sinclair and Yasmin Khan's room at the Sahara Springs Motel to investigate reports from many racists about multiple exaggerated disturbances involving Ryan. He reminded the Doctor and Graham that it was a criminal offence to harbour non-white individuals on segregated premises, before checking the bathroom for Ryan and Yasmin.

When he asked the Doctor and Graham what they were doing in Montgomery, they explained that they were there to pitch the new invention, a smart phone. After he couldn’t find Ryan or Yasmin, he left. (TV: Rosa)

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