Sylvest

Professor Archie Sylvest was the father of Romulus and Remus Sylvest. He was worried that his sons' mathematical genius could be used to alter reality on a massive scale. When he discovered that they had been abducted, he alerted the Interplanetary Pursuit Squadron, who sent Hugo Lang to find them.

In the novelisation, he is given the first name Archie.

_{Biography from the TARDIS Data Core article, licensed under CC-BY-SA}