Gus (Mummy on the Orient Express)
Gus was a computer who controlled the Orient Express. He participated in a scheme to have the Foretold analysed by a party of scientists without their foreknowledge.
Gus assured the compliance of the group, blowing the occupants of the kitchen out into space when the Twelfth Doctor refused to stop his telephone call on request.
After the Foretold was identified and disintegrated, Gus explained that survivors were not required and removed the oxygen from the laboratory. The Doctor teleported the living out. When he attempted to find out, through the train's hardware, who had engineered the gathering, Gus blew up the train to prevent it from being revealed. (TV: Mummy on the Orient Express)
Earlier interaction with the Doctor
Following the wedding of Amy Pond and Rory Williams, the Eleventh Doctor received a call informing him that an Egyptian goddess was loose on the Orient Express in space. Twelve indicates that this was just another trap by Gus. (TV: The Big Bang)
