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Bret Vyon was a Space Security Agent who assisted the Doctor in his quest to stop the Daleks from conquering the Solar System.
Vyon was born in Mars Colony 16. In 3990 he joined the Serivce, made First Rank in 3995 and Second Rank in 3998. His sister, Sara Kingdom, who would also join the Service.
Posted on a mission to Kembel in 4000 with another agent, Kert Gantry to investgate suspicious activity on the part of Mavic Chen, Guardian of the Solar System. Vyon learned that Chen had allied himself with the Daleks.
Vyon stole Chen's Spar and took the Doctor, Steven, and Katarina with him in it to reach Earth in time to warn of Chen's plot. Chen had by this time convinced Bret's sister, Sara Kingdom, that Vyon was a traitor and she killed him. Once Sara learned the truth, Sara allied herself with the Doctor to save Earth and avenge the death of her brother. (DW: The Daleks' Master Plan)