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Sherman was a fifteen-year-old boy who developed an idea for time travel in a science competition.
Biography
Sherman entered a science fair with his theory on time travel. He made a model representation of this theory using a basketball. He met the Second Doctor and Victoria Waterfield at the fair. The Doctor made changes to Sherman's formula. The Doctor did not expect Sherman to understand his corrections, but he did. Sherman used the machine and caused some major changes to the timeline. The Doctor agreed that he would help Sherman win the fair once time was back on track. (ST: The Way Forwards)