Brian's log was the self-named video diary which was kept by Brian Williams to serve as a record of the Year of the Slow Invasion. Specifically, it served to monitor the Shakri cubes that appeared during that year. He maintained the record at the request of the Eleventh Doctor, His son, Rory Williams, objected to the choice of name, however, Brian told him not to mock his log. (TV: The Power of Three)
